diff --git a/.babelrc b/.babelrc
index b311fdc..3008343 100644
--- a/.babelrc
+++ b/.babelrc
@@ -26,9 +26,6 @@
             }
           }
         ]
-      ],
-      "plugins": [
-        "istanbul"
       ]
     }
   }
diff --git a/.nycrc b/.nycrc
deleted file mode 100644
index 7fbf8d9..0000000
--- a/.nycrc
+++ /dev/null
@@ -1,16 +0,0 @@
-{
-  "reporter": [
-    "lcov",
-    "text",
-    "html"
-  ],
-  "include": [
-    "src/**/*.js"
-  ],
-  "exclude": [
-    "src/**/*.spec.js"
-  ],
-  "all": true,
-  "sourceMap": false,
-  "instrument": false
-}
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index f059ed3..af006dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,6 @@ language: node_js
 node_js:
   - "node"
   - "lts/*"
-  - "6"
 cache:
   directories:
     - "node_modules"
diff --git a/package-lock.json b/package-lock.json
index d503ec6..4e1f276 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,56 +13,6 @@
         "@babel/highlight": "7.0.0-beta.49"
       }
     },
-    "@babel/generator": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.0.0-beta.49.tgz",
-      "integrity": "sha1-6c/9qROZaszseTu8JauRvBnQv3o=",
-      "dev": true,
-      "requires": {
-        "@babel/types": "7.0.0-beta.49",
-        "jsesc": "^2.5.1",
-        "lodash": "^4.17.5",
-        "source-map": "^0.5.0",
-        "trim-right": "^1.0.1"
-      },
-      "dependencies": {
-        "jsesc": {
-          "version": "2.5.1",
-          "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.1.tgz",
-          "integrity": "sha1-5CGiqOINawgZ3yiQj3glJrlt0f4=",
-          "dev": true
-        }
-      }
-    },
-    "@babel/helper-function-name": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.49.tgz",
-      "integrity": "sha1-olwRGbnwNSeGcBJuAiXAMEHI3jI=",
-      "dev": true,
-      "requires": {
-        "@babel/helper-get-function-arity": "7.0.0-beta.49",
-        "@babel/template": "7.0.0-beta.49",
-        "@babel/types": "7.0.0-beta.49"
-      }
-    },
-    "@babel/helper-get-function-arity": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.49.tgz",
-      "integrity": "sha1-z1Aj8y0q2S0Ic3STnOwJUby1FEE=",
-      "dev": true,
-      "requires": {
-        "@babel/types": "7.0.0-beta.49"
-      }
-    },
-    "@babel/helper-split-export-declaration": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.49.tgz",
-      "integrity": "sha1-QNeO2glo0BGxxShm5XRs+yPldUg=",
-      "dev": true,
-      "requires": {
-        "@babel/types": "7.0.0-beta.49"
-      }
-    },
     "@babel/highlight": {
       "version": "7.0.0-beta.49",
       "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0-beta.49.tgz",
@@ -105,78 +55,6 @@
         }
       }
     },
-    "@babel/parser": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.0.0-beta.49.tgz",
-      "integrity": "sha1-lE0MW6KBK7FZ7b0iZ0Ov0mUXm9w=",
-      "dev": true
-    },
-    "@babel/template": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.0.0-beta.49.tgz",
-      "integrity": "sha1-44q+ghfLl5P0YaUwbXrXRdg+HSc=",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "7.0.0-beta.49",
-        "@babel/parser": "7.0.0-beta.49",
-        "@babel/types": "7.0.0-beta.49",
-        "lodash": "^4.17.5"
-      }
-    },
-    "@babel/traverse": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.0.0-beta.49.tgz",
-      "integrity": "sha1-TypzaCoYM07WYl0QCo0nMZ98LWg=",
-      "dev": true,
-      "requires": {
-        "@babel/code-frame": "7.0.0-beta.49",
-        "@babel/generator": "7.0.0-beta.49",
-        "@babel/helper-function-name": "7.0.0-beta.49",
-        "@babel/helper-split-export-declaration": "7.0.0-beta.49",
-        "@babel/parser": "7.0.0-beta.49",
-        "@babel/types": "7.0.0-beta.49",
-        "debug": "^3.1.0",
-        "globals": "^11.1.0",
-        "invariant": "^2.2.0",
-        "lodash": "^4.17.5"
-      },
-      "dependencies": {
-        "debug": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
-          "dev": true,
-          "requires": {
-            "ms": "2.0.0"
-          }
-        },
-        "globals": {
-          "version": "11.5.0",
-          "resolved": "https://registry.npmjs.org/globals/-/globals-11.5.0.tgz",
-          "integrity": "sha512-hYyf+kI8dm3nORsiiXUQigOU62hDLfJ9G01uyGMxhc6BKsircrUhC4uJPQPUSuq2GrTmiiEt7ewxlMdBewfmKQ==",
-          "dev": true
-        }
-      }
-    },
-    "@babel/types": {
-      "version": "7.0.0-beta.49",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.0.0-beta.49.tgz",
-      "integrity": "sha1-t+Oxw/TUz+Eb34yJ8e/V4WF7h6Y=",
-      "dev": true,
-      "requires": {
-        "esutils": "^2.0.2",
-        "lodash": "^4.17.5",
-        "to-fast-properties": "^2.0.0"
-      },
-      "dependencies": {
-        "to-fast-properties": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
-          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
-          "dev": true
-        }
-      }
-    },
     "@mrmlnc/readdir-enhanced": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/@mrmlnc/readdir-enhanced/-/readdir-enhanced-2.2.1.tgz",
@@ -199,6 +77,12 @@
       "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
       "dev": true
     },
+    "@types/jest": {
+      "version": "23.1.6",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-23.1.6.tgz",
+      "integrity": "sha512-lBu2tjrfGuj0gARErNmHZJrnWBdRrYk2XqlBY3LRv8Dqxk3w3461uuFMKmwfDDiOa5kzXocUnunCBBacGwF3+A==",
+      "dev": true
+    },
     "@types/node": {
       "version": "10.5.2",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-10.5.2.tgz",
@@ -544,6 +428,12 @@
         "long": "^3.2.0"
       }
     },
+    "abab": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-1.0.4.tgz",
+      "integrity": "sha1-X6rZwsB/YN12dw9xzwJbYqY8/U4=",
+      "dev": true
+    },
     "accepts": {
       "version": "1.3.5",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
@@ -575,6 +465,15 @@
       "integrity": "sha1-8u4fMiipDurRJF+asZIusucdM2s=",
       "dev": true
     },
+    "acorn-globals": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.1.0.tgz",
+      "integrity": "sha512-KjZwU26uG3u6eZcfGbTULzFcsoz6pegNKtHPksZPOUsiKo5bUmiBPa38FuHZ/Eun+XYh/JCCkS9AS3Lu4McQOQ==",
+      "dev": true,
+      "requires": {
+        "acorn": "^5.0.0"
+      }
+    },
     "acorn-jsx": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
@@ -610,12 +509,29 @@
       "integrity": "sha1-rCsnk5xUPpXSwG5/f1wnvkqlQ74=",
       "dev": true
     },
+    "align-text": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "requires": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      }
+    },
     "alphanum-sort": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/alphanum-sort/-/alphanum-sort-1.0.2.tgz",
       "integrity": "sha1-l6ERlkmyEa0zaR2fn0hqjsn74KM=",
       "dev": true
     },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
     "ansi-escapes": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
@@ -645,6 +561,15 @@
         "normalize-path": "^2.0.0"
       }
     },
+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
+    },
     "aproba": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
@@ -681,6 +606,12 @@
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
+    "array-equal": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
+      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
+      "dev": true
+    },
     "array-flatten": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
@@ -763,18 +694,35 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
       "dev": true
     },
-    "assertion-error": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
-      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
-      "dev": true
-    },
     "assign-symbols": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
+    "async": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.1.tgz",
+      "integrity": "sha512-fNEiL2+AZt6AlAw/29Cr0UDe4sRAHCpEHh54WMz+Bb7QfNcFw4h3loofyJpLeQs4Yx7yuqu/2dLgM5hKOs6HlQ==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.10"
+      },
+      "dependencies": {
+        "lodash": {
+          "version": "4.17.10",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.10.tgz",
+          "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+          "dev": true
+        }
+      }
+    },
     "async-each": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
@@ -1073,6 +1021,16 @@
         "babel-template": "^6.24.1"
       }
     },
+    "babel-jest": {
+      "version": "23.4.0",
+      "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-23.4.0.tgz",
+      "integrity": "sha1-IsNMOS4hdvakw2eZKn/P9p0uhVc=",
+      "dev": true,
+      "requires": {
+        "babel-plugin-istanbul": "^4.1.6",
+        "babel-preset-jest": "^23.2.0"
+      }
+    },
     "babel-messages": {
       "version": "6.23.0",
       "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.23.0.tgz",
@@ -1126,6 +1084,12 @@
         }
       }
     },
+    "babel-plugin-jest-hoist": {
+      "version": "23.2.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-jest-hoist/-/babel-plugin-jest-hoist-23.2.0.tgz",
+      "integrity": "sha1-5h+uBaHKiAGq3uV6bWa4zvr0QWc=",
+      "dev": true
+    },
     "babel-plugin-syntax-async-functions": {
       "version": "6.13.0",
       "resolved": "https://registry.npmjs.org/babel-plugin-syntax-async-functions/-/babel-plugin-syntax-async-functions-6.13.0.tgz",
@@ -1492,6 +1456,16 @@
         "semver": "^5.3.0"
       }
     },
+    "babel-preset-jest": {
+      "version": "23.2.0",
+      "resolved": "https://registry.npmjs.org/babel-preset-jest/-/babel-preset-jest-23.2.0.tgz",
+      "integrity": "sha1-jsegOhOPABoaj7HoETZSvxpV2kY=",
+      "dev": true,
+      "requires": {
+        "babel-plugin-jest-hoist": "^23.2.0",
+        "babel-plugin-syntax-object-rest-spread": "^6.13.0"
+      }
+    },
     "babel-register": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-register/-/babel-register-6.26.0.tgz",
@@ -1742,6 +1716,29 @@
       "integrity": "sha1-EsJe/kCkXjwyPrhnWgoM5XsiNx8=",
       "dev": true
     },
+    "browser-process-hrtime": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/browser-process-hrtime/-/browser-process-hrtime-0.1.2.tgz",
+      "integrity": "sha1-Ql1opY00R/AqBKqJQYf86K+Le44=",
+      "dev": true
+    },
+    "browser-resolve": {
+      "version": "1.11.3",
+      "resolved": "https://registry.npmjs.org/browser-resolve/-/browser-resolve-1.11.3.tgz",
+      "integrity": "sha512-exDi1BYWB/6raKHmDTCicQfTkqwN5fioMFV4j8BsfMU4R2DK/QfZfK7kOVkmWCNANf0snkBzqGqAJBao9gZMdQ==",
+      "dev": true,
+      "requires": {
+        "resolve": "1.1.7"
+      },
+      "dependencies": {
+        "resolve": {
+          "version": "1.1.7",
+          "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz",
+          "integrity": "sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=",
+          "dev": true
+        }
+      }
+    },
     "browserify-aes": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/browserify-aes/-/browserify-aes-1.2.0.tgz",
@@ -1822,6 +1819,15 @@
         "electron-to-chromium": "^1.3.47"
       }
     },
+    "bser": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/bser/-/bser-2.0.0.tgz",
+      "integrity": "sha1-mseNPtXZFYBP2HrLFYvHlxR6Fxk=",
+      "dev": true,
+      "requires": {
+        "node-int64": "^0.4.0"
+      }
+    },
     "buble": {
       "version": "0.19.3",
       "resolved": "https://registry.npmjs.org/buble/-/buble-0.19.3.tgz",
@@ -1895,10 +1901,10 @@
         "isarray": "^1.0.0"
       }
     },
-    "buffer-shims": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/buffer-shims/-/buffer-shims-1.0.0.tgz",
-      "integrity": "sha1-mXjOMXOIxkmth5MCjDR37wRKi1E=",
+    "buffer-from": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.0.tgz",
+      "integrity": "sha512-c5mRlguI/Pe2dSZmpER62rSCu0ryKmWddzRYsuXc50U2/g8jMOulc31VZMa4mYx31U5xsmSOpDCgH88Vl9cDGQ==",
       "dev": true
     },
     "buffer-xor": {
@@ -2050,24 +2056,30 @@
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       "dev": true
     },
+    "capture-exit": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/capture-exit/-/capture-exit-1.2.0.tgz",
+      "integrity": "sha1-HF/MSJ/QqwDU8ax64QcuMXP7q28=",
+      "dev": true,
+      "requires": {
+        "rsvp": "^3.3.3"
+      }
+    },
     "caseless": {
       "version": "0.12.0",
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
       "dev": true
     },
-    "chai": {
-      "version": "4.1.2",
-      "resolved": "https://registry.npmjs.org/chai/-/chai-4.1.2.tgz",
-      "integrity": "sha1-D2RYS6ZC8PKs4oBiefTwbKI61zw=",
+    "center-align": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
+      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "assertion-error": "^1.0.1",
-        "check-error": "^1.0.1",
-        "deep-eql": "^3.0.0",
-        "get-func-name": "^2.0.0",
-        "pathval": "^1.0.0",
-        "type-detect": "^4.0.0"
+        "align-text": "^0.1.3",
+        "lazy-cache": "^1.0.3"
       }
     },
     "chalk": {
@@ -2089,12 +2101,6 @@
       "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
       "dev": true
     },
-    "check-error": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
-      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
-      "dev": true
-    },
     "check-types": {
       "version": "7.4.0",
       "resolved": "https://registry.npmjs.org/check-types/-/check-types-7.4.0.tgz",
@@ -2134,6 +2140,12 @@
         "tslib": "^1.9.0"
       }
     },
+    "ci-info": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.1.3.tgz",
+      "integrity": "sha512-SK/846h/Rcy8q9Z9CAwGBLfCJ6EkjJWdpelWDufQpqVDYq2Wnnv8zlSO6AMQap02jvhVruKKpEtQOufo3pFhLg==",
+      "dev": true
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+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
+    "watch": {
+      "version": "0.18.0",
+      "resolved": "https://registry.npmjs.org/watch/-/watch-0.18.0.tgz",
+      "integrity": "sha1-KAlUdsbffJDJYxOJkMClQj60uYY=",
+      "dev": true,
+      "requires": {
+        "exec-sh": "^0.2.0",
+        "minimist": "^1.2.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
     "watchpack": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.0.tgz",
@@ -12865,6 +12510,12 @@
         }
       }
     },
+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
     "webpack": {
       "version": "4.12.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.12.0.tgz",
@@ -13273,12 +12924,38 @@
         }
       }
     },
+    "whatwg-encoding": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.3.tgz",
+      "integrity": "sha512-jLBwwKUhi8WtBfsMQlL4bUUcT8sMkAtQinscJAe/M4KHCkHuUJAF6vuB0tueNIw4c8ziO6AkRmgY+jL3a0iiPw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.19"
+      }
+    },
     "whatwg-fetch": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
       "integrity": "sha512-dcQ1GWpOD/eEQ97k66aiEVpNnapVj90/+R+SXTPYGHpYBBypfKJEQjLrvMZ7YXbKm21gXd4NcuxUTjiv1YtLng==",
       "dev": true
     },
+    "whatwg-mimetype": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.1.0.tgz",
+      "integrity": "sha512-FKxhYLytBQiUKjkYteN71fAUA3g6KpNXoho1isLiLSB3N1G4F35Q5vUxWfKFhBwi5IWF27VE6WxhrnnC+m0Mew==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.5.0.tgz",
+      "integrity": "sha512-rhRZRqx/TLJQWUpQ6bmrt2UV4f0HCQ463yQuONJqC6fO2VoEb1pTYddbe59SkYq87aoM5A3bdhMZiUiVws+fzQ==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
     "whet.extend": {
       "version": "0.9.9",
       "resolved": "https://registry.npmjs.org/whet.extend/-/whet.extend-0.9.9.tgz",
@@ -13300,6 +12977,13 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "window-size": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
+      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
+      "dev": true,
+      "optional": true
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
@@ -13362,6 +13046,17 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "write-file-atomic": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.3.0.tgz",
+      "integrity": "sha512-xuPeK4OdjWqtfi59ylvVL0Yn35SF3zgcAcv7rBPFHVaEapaDr4GdGgm3j7ckTwH9wHL7fGmgfAnb0+THrHb8tA==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
     "ws": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/ws/-/ws-4.1.0.tgz",
@@ -13372,6 +13067,12 @@
         "safe-buffer": "~5.1.0"
       }
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
@@ -13390,6 +13091,60 @@
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
+    "yargs": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+      "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
+      "dev": true,
+      "requires": {
+        "cliui": "^4.0.0",
+        "decamelize": "^1.1.1",
+        "find-up": "^2.1.0",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^2.0.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^9.0.2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "dev": true
+        },
+        "cliui": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
+          "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
+          "dev": true,
+          "requires": {
+            "string-width": "^2.1.1",
+            "strip-ansi": "^4.0.0",
+            "wrap-ansi": "^2.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        },
+        "y18n": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+          "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+          "dev": true
+        }
+      }
+    },
     "yargs-parser": {
       "version": "9.0.2",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
diff --git a/package.json b/package.json
index acd79a3..c383aed 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,9 @@
   "scripts": {
     "build": "babel src --out-dir es && microbundle --entry src/index.js --compress false --strict --format cjs,umd",
     "postbuild": "npm run size",
-    "clean": "rimraf es lib coverage .nyc_output",
-    "test": "cross-env BABEL_ENV=test babel-node test/index.js | tap-spec",
-    "cover": "nyc npm test",
+    "clean": "rimraf es lib coverage",
+    "test": "cross-env BABEL_ENV=test jest",
+    "cover": "npm test -- --verbose --coverage --collectCoverageFrom \"src/**/*.js\"",
     "lint": "eslint src test",
     "prepublishOnly": "npm run lint && npm test && npm run clean && npm run build",
     "size": "size-limit"
@@ -34,27 +34,32 @@
   "dependencies": {},
   "devDependencies": {
     "babel-cli": "^6.26.0",
-    "babel-plugin-istanbul": "^4.1.6",
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-preset-env": "^1.7.0",
     "coveralls": "^3.0.1",
     "cross-env": "^5.2.0",
     "eslint": "^4.19.1",
     "eslint-plugin-prettier": "^2.6.0",
-    "isomorphic-fetch": "^2.2.1",
+    "jest": "^23.4.1",
+    "jest-fetch-mock": "^1.6.5",
     "microbundle": "^0.5.1",
-    "nock": "^9.3.3",
-    "nyc": "^12.0.2",
     "prettier": "^1.13.5",
     "rimraf": "^2.6.2",
-    "size-limit": "^0.18.2",
-    "tap-spec": "^5.0.0 ",
-    "tape": "^4.9.1"
+    "size-limit": "^0.18.2"
   },
   "files": [
     "README.md",
     "LICENSE.md",
     "es",
     "lib"
-  ]
+  ],
+  "jest": {
+    "automock": false,
+    "resetMocks": true,
+    "restoreMocks": true,
+    "resetModules": true,
+    "setupFiles": [
+      "./test/setupJest.js"
+    ]
+  }
 }
diff --git a/src/__snapshots__/errors.test.js.snap b/src/__snapshots__/errors.test.js.snap
new file mode 100644
index 0000000..9d164df
--- /dev/null
+++ b/src/__snapshots__/errors.test.js.snap
@@ -0,0 +1,82 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`ApiError matches snapshot 1`] = `[ApiError: 404 - Not Found]`;
+
+exports[`ApiError matches snapshot: object.entries 1`] = `
+Array [
+  Array [
+    "name",
+    "ApiError",
+  ],
+  Array [
+    "status",
+    404,
+  ],
+  Array [
+    "statusText",
+    "Not Found",
+  ],
+  Array [
+    "response",
+    Object {
+      "error": "Resource not found",
+    },
+  ],
+  Array [
+    "message",
+    "404 - Not Found",
+  ],
+]
+`;
+
+exports[`InternalError matches snapshot 1`] = `[InternalError: error thrown in payload function]`;
+
+exports[`InternalError matches snapshot: object.entries 1`] = `
+Array [
+  Array [
+    "name",
+    "InternalError",
+  ],
+  Array [
+    "message",
+    "error thrown in payload function",
+  ],
+]
+`;
+
+exports[`InvalidRSAA matches snapshot 1`] = `[InvalidRSAA: Invalid RSAA]`;
+
+exports[`InvalidRSAA matches snapshot: object.entries 1`] = `
+Array [
+  Array [
+    "name",
+    "InvalidRSAA",
+  ],
+  Array [
+    "message",
+    "Invalid RSAA",
+  ],
+  Array [
+    "validationErrors",
+    Array [
+      "validation error 1",
+      "validation error 2",
+    ],
+  ],
+]
+`;
+
+exports[`RequestError matches snapshot 1`] = `[RequestError: Network request failed]`;
+
+exports[`RequestError matches snapshot: object.entries 1`] = `
+Array [
+  Array [
+    "name",
+    "RequestError",
+  ],
+  Array [
+    "message",
+    "Network request failed",
+  ],
+]
+`;
diff --git a/src/__snapshots__/middleware.test.js.snap b/src/__snapshots__/middleware.test.js.snap
new file mode 100644
index 0000000..94a90e2
--- /dev/null
+++ b/src/__snapshots__/middleware.test.js.snap
@@ -0,0 +1,2011 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-JSON response: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "failureMeta",
+  "payload": [ApiError: 404 - Not Found],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": "failureMeta",
+        "payload": [ApiError: 404 - Not Found],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "failureMeta",
+        "payload": [ApiError: 404 - Not Found],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-empty JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-empty JSON response: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "failureMeta",
+  "payload": [ApiError: 404 - Not Found],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-empty JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": "failureMeta",
+        "payload": [ApiError: 404 - Not Found],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "failureMeta",
+        "payload": [ApiError: 404 - Not Found],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with an empty JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with an empty JSON response: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "failureMeta",
+  "payload": [ApiError: 404 - Not Found],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA on an unsuccessful API call with an empty JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": "failureMeta",
+        "payload": [ApiError: 404 - Not Found],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "failureMeta",
+        "payload": [ApiError: 404 - Not Found],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA when [RSAA].ok returns false on a successful request: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA when [RSAA].ok returns false on a successful request: final result 1`] = `
+Object {
+  "error": true,
+  "meta": undefined,
+  "payload": [ApiError: 200 - OK],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA when [RSAA].ok returns false on a successful request: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [ApiError: 200 - OK],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [ApiError: 200 - OK],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA when [RSAA].ok returns false on a successful request: ok() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Body {
+        "_abort": false,
+        "_bytes": 16,
+        "_raw": Array [
+          Object {
+            "data": Array [
+              123,
+              34,
+              100,
+              97,
+              116,
+              97,
+              34,
+              58,
+              34,
+              49,
+              50,
+              51,
+              52,
+              53,
+              34,
+              125,
+            ],
+            "type": "Buffer",
+          },
+        ],
+        "body": "{\\"data\\":\\"12345\\"}",
+        "bodyUsed": true,
+        "headers": Headers {
+          "_headers": Object {
+            "content-type": Array [
+              "application/json",
+            ],
+          },
+        },
+        "ok": true,
+        "size": 0,
+        "status": 200,
+        "statusText": "OK",
+        "timeout": 0,
+        "url": undefined,
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": false,
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA with an error on a request error: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA with an error on a request error: final result 1`] = `
+Object {
+  "error": true,
+  "meta": undefined,
+  "payload": [RequestError: Test request error],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a failure FSA with an error on a request error: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "someMeta",
+        "payload": "ignoredPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [RequestError: Test request error],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "someMeta",
+        "payload": "ignoredPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [RequestError: Test request error],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-JSON response: final result 1`] = `
+Object {
+  "meta": "successMeta",
+  "payload": undefined,
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": "successMeta",
+        "payload": undefined,
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "successMeta",
+        "payload": undefined,
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response: fetch mock 2`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response: final result 1`] = `
+Object {
+  "meta": "successMeta",
+  "payload": Object {
+    "username": "Alice",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response: final result 2`] = `
+Object {
+  "meta": "successMeta",
+  "payload": Object {
+    "username": "Alice",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": "successMeta",
+        "payload": Object {
+          "username": "Alice",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "successMeta",
+        "payload": Object {
+          "username": "Alice",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response: next mock 2`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": "successMeta",
+        "payload": Object {
+          "username": "Alice",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "successMeta",
+        "payload": Object {
+          "username": "Alice",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with an empty JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with an empty JSON response: final result 1`] = `
+Object {
+  "meta": "successMeta",
+  "payload": Object {},
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA on a successful API call with an empty JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": "successMeta",
+        "payload": Object {},
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "successMeta",
+        "payload": Object {},
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA with an error state on a successful API call with an invalid JSON response: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA with an error state on a successful API call with an invalid JSON response: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "successMeta",
+  "payload": [InternalError: Expected error - simulating invalid JSON],
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must dispatch a success FSA with an error state on a successful API call with an invalid JSON response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": "successMeta",
+        "payload": [InternalError: Expected error - simulating invalid JSON],
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "successMeta",
+        "payload": [InternalError: Expected error - simulating invalid JSON],
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA for an invalid RSAA with a descriptor request type: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "payload": [InvalidRSAA: Invalid RSAA],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "payload": [InvalidRSAA: Invalid RSAA],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA for an invalid RSAA with a string request type: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "payload": [InvalidRSAA: Invalid RSAA],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "payload": [InvalidRSAA: Invalid RSAA],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].bailout fails: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "someMeta",
+  "payload": [RequestError: [RSAA].bailout function failed],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].bailout fails: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].bailout function failed],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].bailout function failed],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].body fails: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "someMeta",
+  "payload": [RequestError: [RSAA].body function failed],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].body fails: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].body function failed],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].body function failed],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].endpoint fails: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "someMeta",
+  "payload": [RequestError: [RSAA].endpoint function failed],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].endpoint fails: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].endpoint function failed],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].endpoint function failed],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].headers fails: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "someMeta",
+  "payload": [RequestError: [RSAA].headers function failed],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].headers fails: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].headers function failed],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].headers function failed],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].ok fails: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].ok fails: final result 1`] = `
+Object {
+  "error": true,
+  "meta": undefined,
+  "payload": [InternalError: [RSAA].ok function failed],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].ok fails: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [InternalError: [RSAA].ok function failed],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [InternalError: [RSAA].ok function failed],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].options fails: final result 1`] = `
+Object {
+  "error": true,
+  "meta": "someMeta",
+  "payload": [RequestError: [RSAA].options function failed],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#apiMiddleware must dispatch an error request FSA when [RSAA].options fails: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].options function failed],
+        "type": "REQUEST",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": "someMeta",
+        "payload": [RequestError: [RSAA].options function failed],
+        "type": "REQUEST",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must dispatch correct error payload when [RSAA].fetch wrapper returns an error response: final result 1`] = `
+Object {
+  "error": true,
+  "meta": undefined,
+  "payload": [ApiError: 500 - Internal Server Error],
+  "type": "FAILURE",
+}
+`;
+
+exports[`#apiMiddleware must dispatch correct error payload when [RSAA].fetch wrapper returns an error response: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [ApiError: 500 - Internal Server Error],
+        "type": "FAILURE",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "error": true,
+        "meta": undefined,
+        "payload": [ApiError: 500 - Internal Server Error],
+        "type": "FAILURE",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must pass actions without an [RSAA] property to the next handler: final result 1`] = `Object {}`;
+
+exports[`#apiMiddleware must pass actions without an [RSAA] property to the next handler: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {},
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use a [RSAA].fetch custom fetch wrapper when present: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use a [RSAA].fetch custom fetch wrapper when present: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "error": false,
+    "foo": "bar",
+    "id": 1,
+    "name": "Alan",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use a [RSAA].fetch custom fetch wrapper when present: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "error": false,
+          "foo": "bar",
+          "id": 1,
+          "name": "Alan",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "error": false,
+          "foo": "bar",
+          "id": 1,
+          "name": "Alan",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].bailout function when present: bailout() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": true,
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].body function when present: body() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": "mockBody",
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].body function when present: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": "mockBody",
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].body function when present: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].body function when present: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].endpoint function when present: endpoint() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": "http://127.0.0.1/api/users/1",
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].endpoint function when present: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].endpoint function when present: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].endpoint function when present: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].headers function when present: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {
+          "Test-Header": "test",
+        },
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].headers function when present: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].headers function when present: headers() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "Test-Header": "test",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].headers function when present: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].ok function when present: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].ok function when present: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].ok function when present: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].ok function when present: ok() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Body {
+        "_abort": false,
+        "_bytes": 16,
+        "_raw": Array [
+          Object {
+            "data": Array [
+              123,
+              34,
+              100,
+              97,
+              116,
+              97,
+              34,
+              58,
+              34,
+              49,
+              50,
+              51,
+              52,
+              53,
+              34,
+              125,
+            ],
+            "type": "Buffer",
+          },
+        ],
+        "body": "{\\"data\\":\\"12345\\"}",
+        "bodyUsed": true,
+        "headers": Headers {
+          "_headers": Object {
+            "content-type": Array [
+              "application/json",
+            ],
+          },
+        },
+        "ok": true,
+        "size": 0,
+        "status": 200,
+        "statusText": "OK",
+        "timeout": 0,
+        "url": undefined,
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": true,
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].options function when present: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].options function when present: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].options function when present: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use an [RSAA].options function when present: options() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use meta property of request type descriptor when it is a function: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use meta property of request type descriptor when it is a function: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use meta property of request type descriptor when it is a function: meta() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "@@redux-api-middleware/RSAA": Object {
+          "endpoint": "http://127.0.0.1/api/users/1",
+          "method": "GET",
+          "types": Array [
+            Object {
+              "meta": "requestMeta",
+              "payload": "requestPayload",
+              "type": "REQUEST",
+            },
+            "SUCCESS",
+            "FAILURE",
+          ],
+        },
+      },
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": "requestMeta",
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use meta property of request type descriptor when it is a function: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use payload property of request type descriptor when it is a function: fetch mock 1`] = `
+Object {
+  "calls": Array [
+    Array [
+      "http://127.0.0.1/api/users/1",
+      Object {
+        "body": undefined,
+        "credentials": undefined,
+        "headers": Object {},
+        "method": "GET",
+      },
+    ],
+  ],
+  "instances": Array [
+    undefined,
+  ],
+  "invocationCallOrder": Any<Object>,
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Promise {},
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use payload property of request type descriptor when it is a function: final result 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Object {
+    "data": "12345",
+  },
+  "type": "SUCCESS",
+}
+`;
+
+exports[`#apiMiddleware must use payload property of request type descriptor when it is a function: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    ],
+    Array [
+      Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": "requestMeta",
+        "payload": "requestPayload",
+        "type": "REQUEST",
+      },
+    },
+    Object {
+      "isThrow": false,
+      "value": Object {
+        "meta": undefined,
+        "payload": Object {
+          "data": "12345",
+        },
+        "type": "SUCCESS",
+      },
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware must use payload property of request type descriptor when it is a function: payload() 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {
+        "@@redux-api-middleware/RSAA": Object {
+          "endpoint": "http://127.0.0.1/api/users/1",
+          "method": "GET",
+          "types": Array [
+            Object {
+              "meta": "requestMeta",
+              "payload": "requestPayload",
+              "type": "REQUEST",
+            },
+            "SUCCESS",
+            "FAILURE",
+          ],
+        },
+      },
+      undefined,
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": "requestPayload",
+    },
+  ],
+}
+`;
+
+exports[`#apiMiddleware mustn't return a promise on actions without a [RSAA] property: final result 1`] = `Object {}`;
+
+exports[`#apiMiddleware mustn't return a promise on actions without a [RSAA] property: next mock 1`] = `
+[MockFunction] {
+  "calls": Array [
+    Array [
+      Object {},
+    ],
+  ],
+  "results": Array [
+    Object {
+      "isThrow": false,
+      "value": Object {},
+    },
+  ],
+}
+`;
diff --git a/src/__snapshots__/util.test.js.snap b/src/__snapshots__/util.test.js.snap
new file mode 100644
index 0000000..ca1c50a
--- /dev/null
+++ b/src/__snapshots__/util.test.js.snap
@@ -0,0 +1,109 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`#actionWith handles a synchronous meta function 1`] = `
+Object {
+  "meta": "someMeta",
+  "payload": undefined,
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles a synchronous payload function 1`] = `
+Object {
+  "meta": undefined,
+  "payload": "somePayload",
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles an asynchronous meta function 1`] = `
+Object {
+  "meta": Promise {},
+  "payload": undefined,
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles an asynchronous payload function 1`] = `
+Object {
+  "meta": undefined,
+  "payload": Promise {},
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles an error in the meta function 1`] = `
+Object {
+  "error": true,
+  "payload": [InternalError: test error in meta function],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles an error in the payload function 1`] = `
+Object {
+  "error": true,
+  "meta": undefined,
+  "payload": [InternalError: test error in payload function],
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles function payload and meta descriptor properties 1`] = `
+Object {
+  "meta": "someMetaFromFn",
+  "payload": "somePayloadFromFn",
+  "type": "REQUEST",
+}
+`;
+
+exports[`#actionWith handles string payload and meta descriptor properties 1`] = `
+Object {
+  "error": true,
+  "meta": "someMeta",
+  "payload": "somePayload",
+  "type": "REQUEST",
+}
+`;
+
+exports[`#getJSON returns the JSON body of a response with a JSONy 'Content-Type' header 1`] = `
+Object {
+  "message": "ok",
+}
+`;
+
+exports[`#normalizeTypeDescriptors handles object types 1`] = `
+Array [
+  Object {
+    "meta": "requestMeta",
+    "payload": "requestPayload",
+    "type": "REQUEST",
+  },
+  Object {
+    "meta": "successMeta",
+    "payload": "successPayload",
+    "type": "SUCCESS",
+  },
+  Object {
+    "meta": "failureMeta",
+    "payload": "failurePayload",
+    "type": "FAILURE",
+  },
+]
+`;
+
+exports[`#normalizeTypeDescriptors handles string types 1`] = `
+Array [
+  Object {
+    "type": "REQUEST",
+  },
+  Object {
+    "payload": [Function],
+    "type": "SUCCESS",
+  },
+  Object {
+    "payload": [Function],
+    "type": "FAILURE",
+  },
+]
+`;
diff --git a/src/__snapshots__/validation.test.js.snap b/src/__snapshots__/validation.test.js.snap
new file mode 100644
index 0000000..5236a0b
--- /dev/null
+++ b/src/__snapshots__/validation.test.js.snap
@@ -0,0 +1,139 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].bailout property 1`] = `
+Array [
+  "[RSAA].bailout property must be undefined, a boolean, or a function",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].credentials property 1`] = `
+Array [
+  "[RSAA].credentials property must be undefined, or a string",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].credentials property 2`] = `
+Array [
+  "Invalid [RSAA].credentials: InvalidCredentials",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].endpoint property 1`] = `
+Array [
+  "[RSAA].endpoint property must be a string or a function",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].fetch property 1`] = `
+Array [
+  "[RSAA].fetch property must be a function",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].headers property 1`] = `
+Array [
+  "[RSAA].headers property must be undefined, a plain JavaScript object, or a function",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].method property 1`] = `
+Array [
+  "[RSAA].method property must be a string",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].method property 2`] = `
+Array [
+  "Invalid [RSAA].method: INVALID_METHOD",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].ok property 1`] = `
+Array [
+  "[RSAA].ok property must be a function",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].options property 1`] = `
+Array [
+  "[RSAA].options property must be undefined, a plain JavaScript object, or a function",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].types property 1`] = `
+Array [
+  "[RSAA].types property must be an array of length 3",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].types property 2`] = `
+Array [
+  "[RSAA].types property must be an array of length 3",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid [RSAA].types property 3`] = `
+Array [
+  "Invalid request type",
+  "Invalid success type",
+  "Invalid failure type",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid RSAA value 1`] = `
+Array [
+  "[RSAA] property must be a plain JavaScript object",
+  "[RSAA] must have an endpoint property",
+  "[RSAA] must have a method property",
+  "[RSAA] must have a types property",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid RSAA value 2`] = `
+Array [
+  "Invalid [RSAA] key: invalidKey",
+  "[RSAA] must have an endpoint property",
+  "[RSAA] must have a method property",
+  "[RSAA] must have a types property",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles invalid actions 1`] = `
+Array [
+  "RSAAs must be plain JavaScript objects with an [RSAA] property",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles missing RSAA properties 1`] = `
+Array [
+  "[RSAA] must have an endpoint property",
+  "[RSAA] must have a method property",
+  "[RSAA] must have a types property",
+]
+`;
+
+exports[`#validateRSAA / #isValidRSAA handles top-level string properties other than RSAA 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles top-level symbol properties other than RSAA 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with bailout boolean 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with bailout function 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with endpoint function 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with endpoint string 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with fetch function 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with headers function 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with headers object 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with options function 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with options object 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with types of symbols 1`] = `Array []`;
+
+exports[`#validateRSAA / #isValidRSAA handles valid RSAA with types of type descriptors 1`] = `Array []`;
diff --git a/src/errors.test.js b/src/errors.test.js
new file mode 100644
index 0000000..c0e482d
--- /dev/null
+++ b/src/errors.test.js
@@ -0,0 +1,61 @@
+// Public package exports
+import {
+  InvalidRSAA,
+  InternalError,
+  RequestError,
+  ApiError
+} from './index.js';
+
+describe('InvalidRSAA', () => {
+  const validationErrors = ['validation error 1', 'validation error 2'];
+  const error = new InvalidRSAA(validationErrors);
+
+  it('is an error object', () => {
+    expect(error).toBeInstanceOf(Error)
+  })
+
+  it('matches snapshot', () => {
+    expect(error).toMatchSnapshot()
+    expect(Object.entries(error)).toMatchSnapshot('object.entries')
+  })
+})
+
+describe('InternalError', () => {
+  const error = new InternalError('error thrown in payload function');
+
+  it('is an error object', () => {
+    expect(error).toBeInstanceOf(Error)
+  })
+
+  it('matches snapshot', () => {
+    expect(error).toMatchSnapshot()
+    expect(Object.entries(error)).toMatchSnapshot('object.entries')
+  })
+})
+
+describe('RequestError', () => {
+  const error = new RequestError('Network request failed');
+
+  it('is an error object', () => {
+    expect(error).toBeInstanceOf(Error)
+  })
+
+  it('matches snapshot', () => {
+    expect(error).toMatchSnapshot()
+    expect(Object.entries(error)).toMatchSnapshot('object.entries')
+  })
+})
+
+describe('ApiError', () => {
+  const json = { error: 'Resource not found' };
+  const error = new ApiError(404, 'Not Found', json);
+
+  it('is an error object', () => {
+    expect(error).toBeInstanceOf(Error)
+  })
+
+  it('matches snapshot', () => {
+    expect(error).toMatchSnapshot()
+    expect(Object.entries(error)).toMatchSnapshot('object.entries')
+  })
+})
\ No newline at end of file
diff --git a/src/middleware.test.js b/src/middleware.test.js
new file mode 100644
index 0000000..582a31a
--- /dev/null
+++ b/src/middleware.test.js
@@ -0,0 +1,944 @@
+// Public package exports
+import {
+  RSAA,
+  apiMiddleware,
+  createMiddleware,
+  InternalError
+} from './index.js';
+
+const fetchMockSnapshotMatcher = {
+  invocationCallOrder: expect.any(Object)
+};
+// const fetchMockSnapshotMatcher = {};
+
+const doTestMiddleware = async ({ response, action }) => {
+  if (response) {
+    const { body, ...mockConfig } = response
+    fetch.mockResponseOnce(
+      body,
+      mockConfig
+    )
+  }
+
+  const doGetState = jest.fn();
+  doGetState.mockImplementation(() => {});
+  const doNext = jest.fn();
+  doNext.mockImplementation(it => it);
+
+  const nextHandler = apiMiddleware({ getState: doGetState });
+  const actionHandler = nextHandler(doNext);
+  const result = actionHandler(action);
+
+  if (result) {
+    const final = await result;
+    if (final) {
+      expect(final).toMatchSnapshot({}, 'final result')
+    }
+  }
+
+  if (doNext.mock.calls.length) {
+    expect(doNext).toMatchSnapshot({}, 'next mock')
+  }
+
+  if (fetch.mock.calls.length) {
+    expect(fetch.mock).toMatchSnapshot({
+      invocationCallOrder: expect.any(Object)
+    }, 'fetch mock');
+  }
+
+  return {
+    doGetState,
+    nextHandler,
+    doNext,
+    actionHandler,
+    result
+  }
+}
+
+describe('#createMiddleware', () => {
+  it('returns a redux middleware', () => {
+    const doGetState = () => {};
+    const middleware = createMiddleware();
+    const nextHandler = middleware({ getState: doGetState });
+    const doNext = () => {};
+    const actionHandler = nextHandler(doNext);
+
+    expect(typeof middleware).toEqual('function')
+    expect(middleware.length).toEqual(1)
+
+    expect(typeof nextHandler).toEqual('function')
+    expect(nextHandler.length).toEqual(1)
+
+    expect(typeof actionHandler).toEqual('function')
+    expect(actionHandler.length).toEqual(1)
+  })
+})
+
+describe('#apiMiddleware', () => {
+  it('is a redux middleware', () => {
+    const doGetState = () => {};
+    const nextHandler = apiMiddleware({ getState: doGetState });
+    const doNext = () => {};
+    const actionHandler = nextHandler(doNext);
+
+    expect(typeof apiMiddleware).toEqual('function')
+    expect(apiMiddleware.length).toEqual(1)
+
+    expect(typeof nextHandler).toEqual('function')
+    expect(nextHandler.length).toEqual(1)
+
+    expect(typeof actionHandler).toEqual('function')
+    expect(actionHandler.length).toEqual(1)
+  })
+
+  it('must pass actions without an [RSAA] property to the next handler', async () => {
+    const action = {};
+
+    const { doNext } = await doTestMiddleware({
+      action
+    })
+    expect(doNext).toHaveBeenCalledWith(action)
+  })
+
+  it("mustn't return a promise on actions without a [RSAA] property", async () => {
+    const action = {};
+
+    const { result } = await doTestMiddleware({
+      action
+    })
+
+    expect(result.then).toBeUndefined();
+  })
+
+  it("must return a promise on actions without a [RSAA] property", async () => {
+    const action = { [RSAA]: {} };
+
+    const { result } = await doTestMiddleware({
+      action
+    })
+
+    expect(typeof result.then).toEqual('function');
+  })
+
+  it('must dispatch an error request FSA for an invalid RSAA with a string request type', async () => {
+    const action = {
+      [RSAA]: {
+        types: ['REQUEST']
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+
+  })
+
+  it('must dispatch an error request FSA for an invalid RSAA with a descriptor request type', async () => {
+    const action = {
+      [RSAA]: {
+        types: [
+          {
+            type: 'REQUEST'
+          }
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+
+  })
+
+  it('must do nothing for an invalid RSAA without a request type', async () => {
+    const action = {
+      [RSAA]: {}
+    };
+
+    const { doNext } = await doTestMiddleware({
+      action
+    })
+
+    expect(doNext).not.toHaveBeenCalled();
+  })
+
+
+  it('must dispatch an error request FSA when [RSAA].bailout fails', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        bailout: () => {
+          throw new Error();
+        },
+        types: [
+          {
+            type: 'REQUEST',
+            payload: () => 'ignoredPayload',
+            meta: () => 'someMeta'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  // FIXME this doesnt seem like it needs async/await,
+  // but actionHandler is returning a promise
+  it('must dispatch an error request FSA when [RSAA].body fails', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        body: () => {
+          throw new Error();
+        },
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'ignoredPayload',
+            meta: 'someMeta'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  it('must dispatch an error request FSA when [RSAA].endpoint fails', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: () => {
+          throw new Error();
+        },
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'ignoredPayload',
+            meta: 'someMeta'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  it('must dispatch an error request FSA when [RSAA].headers fails', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        headers: () => {
+          throw new Error();
+        },
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'ignoredPayload',
+            meta: 'someMeta'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  it('must dispatch an error request FSA when [RSAA].options fails', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        options: () => {
+          throw new Error();
+        },
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'ignoredPayload',
+            meta: 'someMeta'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  it('must dispatch an error request FSA when [RSAA].ok fails', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        ok: () => {
+          throw new Error();
+        },
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+  })
+
+  it('must dispatch a failure FSA with an error on a request error', async () => {
+    fetch.mockRejectOnce(new Error('Test request error'))
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'ignoredPayload',
+            meta: 'someMeta'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  it('must use an [RSAA].bailout boolean when present', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        bailout: true
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+    })
+  })
+
+  it('must use an [RSAA].bailout function when present', async () => {
+    const bailout = jest.fn();
+    bailout.mockReturnValue(true)
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        bailout
+      }
+    };
+
+    const { doNext } = await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(bailout).toMatchSnapshot({}, 'bailout()');
+    expect(doNext).not.toHaveBeenCalled()
+  })
+
+  it('must use an [RSAA].body function when present', async () => {
+    const body = jest.fn();
+    body.mockReturnValue('mockBody')
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        body
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(body).toMatchSnapshot({}, 'body()');
+  })
+
+  it('must use an [RSAA].endpoint function when present', async () => {
+    const endpoint = jest.fn();
+    endpoint.mockReturnValue('http://127.0.0.1/api/users/1')
+
+    const action = {
+      [RSAA]: {
+        endpoint,
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(endpoint).toMatchSnapshot({}, 'endpoint()');
+  })
+
+  it('must use an [RSAA].headers function when present', async () => {
+    const headers = jest.fn();
+    headers.mockReturnValue({ 'Test-Header': 'test' })
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        headers
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(headers).toMatchSnapshot({}, 'headers()');
+  })
+
+  it('must use an [RSAA].options function when present', async () => {
+    const options = jest.fn();
+    options.mockReturnValue({})
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        options
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(options).toMatchSnapshot({}, 'options()');
+  })
+
+  it('must use an [RSAA].ok function when present', async () => {
+    const ok = jest.fn();
+    ok.mockReturnValue(true)
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        ok
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(ok).toMatchSnapshot({}, 'ok()');
+  })
+
+  it('must dispatch a failure FSA when [RSAA].ok returns false on a successful request', async () => {
+    const ok = jest.fn();
+    ok.mockReturnValue(false)
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        ok
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(ok).toMatchSnapshot({}, 'ok()');
+  })
+
+  it('must use a [RSAA].fetch custom fetch wrapper when present', async () => {
+    const myFetch = async (endpoint, opts) => {
+      const res = await fetch(endpoint, opts);
+      const json = await res.json();
+
+      return new Response(
+        JSON.stringify({
+          ...json,
+          foo: 'bar'
+        }),
+        {
+          // Example of custom `res.ok`
+          status: json.error ? 500 : 200,
+          headers: {
+            'Content-Type': 'application/json'
+          }
+        }
+      );
+    };
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        fetch: myFetch
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({
+          id: 1,
+          name: 'Alan',
+          error: false
+        }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+  })
+
+  it('must dispatch correct error payload when [RSAA].fetch wrapper returns an error response', async () => {
+    const myFetch = async (endpoint, opts) => {
+      return new Response(
+        JSON.stringify({
+          foo: 'bar'
+        }),
+        {
+          status: 500,
+          headers: {
+            'Content-Type': 'application/json'
+          }
+        }
+      );
+    };
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        fetch: myFetch
+      }
+    };
+
+    await doTestMiddleware({
+      action
+    })
+  })
+
+  it('must use payload property of request type descriptor when it is a function', async () => {
+    const payload = jest.fn()
+    payload.mockReturnValue('requestPayload')
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            meta: 'requestMeta',
+            payload
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(payload).toMatchSnapshot({}, 'payload()');
+  })
+
+  it('must use meta property of request type descriptor when it is a function', async () => {
+    const meta = jest.fn()
+    meta.mockReturnValue('requestMeta')
+
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            meta,
+            payload: 'requestPayload'
+          },
+          'SUCCESS',
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ data: '12345' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+    expect(meta).toMatchSnapshot({}, 'meta()');
+  })
+
+  it('must dispatch a success FSA on a successful API call with a non-empty JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          {
+            type: 'SUCCESS',
+            meta: 'successMeta'
+          },
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ username: 'Alice' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+  })
+
+  it('must dispatch a success FSA on a successful API call with a non-empty JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          {
+            type: 'SUCCESS',
+            meta: 'successMeta'
+          },
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ username: 'Alice' }),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+  })
+
+  it('must dispatch a success FSA on a successful API call with an empty JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          {
+            type: 'SUCCESS',
+            meta: 'successMeta'
+          },
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({}),
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+  })
+
+  it('must dispatch a success FSA with an error state on a successful API call with an invalid JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          {
+            type: 'SUCCESS',
+            meta: 'successMeta',
+            payload: () => {
+              throw new InternalError('Expected error - simulating invalid JSON');
+            }
+          },
+          'FAILURE'
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: '',
+        status: 200,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+  })
+
+  it('must dispatch a success FSA on a successful API call with a non-JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          {
+            type: 'SUCCESS',
+            meta: 'successMeta'
+          },
+          'FAILURE'
+        ]
+
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: null,
+        status: 200,
+      }
+    })
+
+  })
+
+  it('must dispatch a failure FSA on an unsuccessful API call with a non-empty JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          'SUCCESS',
+          {
+            type: 'FAILURE',
+            meta: 'failureMeta'
+          }
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ error: 'Resource not found' }),
+        status: 404,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+
+  })
+
+  it('must dispatch a failure FSA on an unsuccessful API call with an empty JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          'SUCCESS',
+          {
+            type: 'FAILURE',
+            meta: 'failureMeta'
+          }
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: JSON.stringify({ }),
+        status: 404,
+        headers: {
+          'Content-Type': 'application/json'
+        }
+      }
+    })
+  })
+
+  it('must dispatch a failure FSA on an unsuccessful API call with a non-JSON response', async () => {
+    const action = {
+      [RSAA]: {
+        endpoint: 'http://127.0.0.1/api/users/1',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          'SUCCESS',
+          {
+            type: 'FAILURE',
+            meta: 'failureMeta'
+          }
+        ]
+      }
+    };
+
+    await doTestMiddleware({
+      action,
+      response: {
+        body: '',
+        status: 404
+      }
+    })
+  })
+})
diff --git a/src/util.test.js b/src/util.test.js
new file mode 100644
index 0000000..3455ab5
--- /dev/null
+++ b/src/util.test.js
@@ -0,0 +1,165 @@
+// Public package exports
+import {
+  RSAA,
+  getJSON
+} from './index.js';
+
+// Private package import
+import { normalizeTypeDescriptors, actionWith } from './util';
+
+describe('#normalizeTypeDescriptors', () => {
+  it('handles string types', () => {
+    const types = ['REQUEST', 'SUCCESS', 'FAILURE'];
+    const descriptors = normalizeTypeDescriptors(types);
+    expect(descriptors).toMatchSnapshot()
+  })
+
+  it('handles object types', () => {
+    const types = [
+      {
+        type: 'REQUEST',
+        payload: 'requestPayload',
+        meta: 'requestMeta'
+      },
+      {
+        type: 'SUCCESS',
+        payload: 'successPayload',
+        meta: 'successMeta'
+      },
+      {
+        type: 'FAILURE',
+        payload: 'failurePayload',
+        meta: 'failureMeta'
+      }
+    ];
+    const descriptors = normalizeTypeDescriptors(types);
+    expect(descriptors).toMatchSnapshot()
+  })
+})
+
+describe('#actionWith', () => {
+  it('handles string payload and meta descriptor properties', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      payload: 'somePayload',
+      meta: 'someMeta',
+      error: true
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('handles function payload and meta descriptor properties', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      payload: () => 'somePayloadFromFn',
+      meta: () => 'someMetaFromFn'
+    })
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('passes function payload and meta descriptor properties arguments', async () => {
+    const payload = jest.fn();
+    payload.mockReturnValue('somePayloadFromMock')
+    const meta = jest.fn();
+    meta.mockReturnValue('someMetaFromMock')
+
+    const passedArgs = ['action', 'state', 'res'];
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      payload,
+      meta
+    }, passedArgs)
+
+    expect(payload).toHaveBeenCalledWith(...passedArgs)
+    expect(meta).toHaveBeenCalledWith(...passedArgs)
+  })
+
+  it('handles an error in the payload function', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      payload: () => {
+        throw new Error('test error in payload function');
+      }
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('handles an error in the meta function', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      meta: () => {
+        throw new Error('test error in meta function');
+      }
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('handles a synchronous payload function', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      payload: () => 'somePayload',
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('handles an asynchronous payload function', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      payload: new Promise(resolve => setTimeout(() => resolve('somePayloadAsync'), 250)),
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('handles a synchronous meta function', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      meta: () => 'someMeta',
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+
+  it('handles an asynchronous meta function', async () => {
+    const fsa = await actionWith({
+      type: 'REQUEST',
+      meta: new Promise(resolve => setTimeout(() => resolve('someMetaAsync'), 250)),
+    })
+
+    expect(fsa).toMatchSnapshot()
+  })
+})
+
+describe('#getJSON', () => {
+  it("returns the JSON body of a response with a JSONy 'Content-Type' header", async () => {
+    const res = {
+      headers: {
+        get(name) {
+          return name === 'Content-Type' ? 'application/json' : undefined;
+        }
+      },
+      json() {
+        return Promise.resolve({ message: 'ok' });
+      }
+    };
+
+    const result = await getJSON(res);
+    expect(result).toMatchSnapshot();
+  })
+
+  it("returns a resolved promise for a response with a not-JSONy 'Content-Type' header", async () => {
+    const res = {
+      headers: {
+        get(name) {
+          return name === 'Content-Type' ? 'not it' : undefined;
+        }
+      }
+    };
+    const result = await getJSON(res);
+    expect(result).toBeUndefined()
+  })
+})
diff --git a/src/validation.test.js b/src/validation.test.js
new file mode 100644
index 0000000..336bb6f
--- /dev/null
+++ b/src/validation.test.js
@@ -0,0 +1,469 @@
+// Public package exports
+import {
+  RSAA,
+  isRSAA,
+  validateRSAA,
+  isValidRSAA
+} from './index.js';
+
+// Private package import
+import { isValidTypeDescriptor } from './validation';
+
+describe('#isValidTypeDescriptor', () => {
+  it('must be a plain JavaScript object', () => {
+    var descriptor = '';
+    expect(isValidTypeDescriptor(descriptor)).toBeFalsy();
+  })
+
+  it('must not have properties other than type, payload and meta', () => {
+    var descriptor = {
+      type: '',
+      invalidKey: ''
+    };
+    expect(isValidTypeDescriptor(descriptor)).toBeFalsy();
+  })
+
+  it('must have a type property', () => {
+    var descriptor = {};
+    expect(isValidTypeDescriptor(descriptor)).toBeFalsy();
+  })
+
+  it('must not have a type property that is not a string or a symbol', () => {
+    var descriptor = {
+      type: {}
+    };
+    expect(isValidTypeDescriptor(descriptor)).toBeFalsy();
+  })
+
+  it('may have a type property that is a string', () => {
+    var descriptor = {
+      type: ''
+    };
+    expect(isValidTypeDescriptor(descriptor)).toBeTruthy();
+  })
+
+  it('may have a type property that is a symbol', () => {
+    var descriptor = {
+      type: Symbol()
+    };
+    expect(isValidTypeDescriptor(descriptor)).toBeTruthy();
+  })
+})
+
+describe('#isRSAA', () => {
+  it('RSAAs must be plain JavaScript objects', () => {
+    expect(isRSAA('')).toBeFalsy()
+  })
+
+  it('RSAAs must have an [RSAA] property', () => {
+    expect(isRSAA({})).toBeFalsy()
+  })
+
+  it('returns true for an RSAA', () => {
+    expect(isRSAA({ [RSAA]: {}})).toBeTruthy()
+  })
+})
+
+describe('#validateRSAA / #isValidRSAA', () => {
+  it('handles invalid actions', () => {
+    expect(isValidRSAA('')).toBeFalsy();
+    expect(validateRSAA('')).toMatchSnapshot();
+  })
+
+  it('handles invalid RSAA value', () => {
+    const action = {
+      [RSAA]: ''
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid RSAA value', () => {
+    const action = {
+      [RSAA]: { invalidKey: '' }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles missing RSAA properties', () => {
+    const action = {
+      [RSAA]: {}
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].endpoint property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: {},
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].method property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: {},
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].method property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'INVALID_METHOD',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].headers property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        headers: ''
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].credentials property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        credentials: {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].credentials property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        credentials: 'InvalidCredentials'
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].bailout property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        bailout: ''
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].types property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].types property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['a', 'b']
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].types property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: [{}, {}, {}]
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].options property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        options: ''
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].fetch property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        fetch: {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles invalid [RSAA].ok property', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        ok: {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeFalsy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with endpoint string', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with endpoint function', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: () => '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with headers object', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        headers: {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with headers function', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        headers: () => ({})
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with bailout boolean', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        bailout: false
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with bailout function', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        bailout: () => false
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with types of symbols', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: [Symbol(), Symbol(), Symbol()]
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with types of type descriptors', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: [
+          {
+            type: 'REQUEST',
+            payload: 'requestPayload',
+            meta: 'requestMeta'
+          },
+          {
+            type: 'SUCCESS',
+            payload: 'successPayload',
+            meta: 'successMeta'
+          },
+          {
+            type: 'FAILURE',
+            payload: 'failurePayload',
+            meta: 'failureMeta'
+          }
+        ]
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with options object', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        options: {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with options function', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        options: () => ({})
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles valid RSAA with fetch function', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE'],
+        fetch: () => {}
+      }
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  });
+
+  it('handles top-level string properties other than RSAA', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      },
+      anotherKey: 'foo'
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  })
+
+  it('handles top-level symbol properties other than RSAA', () => {
+    const action = {
+      [RSAA]: {
+        endpoint: '',
+        method: 'GET',
+        types: ['REQUEST', 'SUCCESS', 'FAILURE']
+      },
+      [Symbol('action30 Symbol')]: 'foo'
+    };
+
+    expect(isValidRSAA(action)).toBeTruthy();
+    expect(validateRSAA(action)).toMatchSnapshot();
+  })
+})
\ No newline at end of file
diff --git a/test/index.js b/test/index.js
deleted file mode 100644
index a822851..0000000
--- a/test/index.js
+++ /dev/null
@@ -1,2251 +0,0 @@
-import test from 'tape';
-import 'isomorphic-fetch';
-import nock from 'nock';
-
-// Public package exports
-import {
-  RSAA,
-  isRSAA,
-  validateRSAA,
-  isValidRSAA,
-  InvalidRSAA,
-  InternalError,
-  RequestError,
-  ApiError,
-  getJSON,
-  apiMiddleware,
-  createMiddleware
-} from '../src';
-
-// Private module exports
-import { isValidTypeDescriptor } from '../src/validation';
-import { normalizeTypeDescriptors, actionWith } from '../src/util';
-
-test('isRSAA must identify RSAAs', t => {
-  const action1 = '';
-  t.notOk(isRSAA(action1), 'RSAAs must be plain JavaScript objects');
-
-  const action2 = {};
-  t.notOk(isRSAA(action2), 'RSAAs must have an [RSAA] property');
-
-  const action3 = {
-    [RSAA]: {}
-  };
-  t.ok(isRSAA(action3), 'isRSAA must return true for an RSAA');
-
-  t.end();
-});
-
-test('isValidTypeDescriptor must identify conformant type descriptors', t => {
-  var descriptor1 = '';
-  t.notOk(
-    isValidTypeDescriptor(descriptor1),
-    'type descriptors must be plain JavaScript objects'
-  );
-
-  var descriptor2 = {
-    type: '',
-    invalidKey: ''
-  };
-  t.notOk(
-    isValidTypeDescriptor(descriptor2),
-    'type descriptors must not have properties other than type, payload and meta'
-  );
-
-  var descriptor3 = {};
-  t.notOk(
-    isValidTypeDescriptor(descriptor3),
-    'type descriptors must have a type property'
-  );
-
-  var descriptor4 = {
-    type: {}
-  };
-  t.notOk(
-    isValidTypeDescriptor(descriptor4),
-    'type property must be a string, or a symbol'
-  );
-
-  var descriptor5 = {
-    type: ''
-  };
-  t.ok(isValidTypeDescriptor(descriptor5), 'type property may be a string');
-
-  var descriptor6 = {
-    type: Symbol()
-  };
-  t.ok(isValidTypeDescriptor(descriptor6), 'type property may be a symbol');
-
-  t.end();
-});
-
-test('validateRSAA/isValidRSAA must identify conformant RSAAs', t => {
-  const action1 = '';
-  t.ok(
-    validateRSAA(action1).length === 1 &&
-      validateRSAA(action1).includes(
-        'RSAAs must be plain JavaScript objects with an [RSAA] property'
-      ),
-    'RSAAs must be plain JavaScript objects with an [RSAA] property (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action1),
-    'RSAAs must be plain JavaScript objects with an [RSAA] property (isValidRSAA)'
-  );
-
-  const action2 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    },
-    anotherKey: 'foo'
-  };
-  t.equal(
-    validateRSAA(action2).length,
-    0,
-    'RSAAs may have properties other than [RSAA] (validateRSAA)'
-  );
-
-  const action3 = {
-    [RSAA]: ''
-  };
-  t.ok(
-    validateRSAA(action3).includes(
-      '[RSAA] property must be a plain JavaScript object'
-    ),
-    '[RSAA] property must be a plain JavaScript object (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action3),
-    '[RSAA] property must be a plain JavaScript object (isValidRSAA)'
-  );
-
-  const action4 = {
-    [RSAA]: { invalidKey: '' }
-  };
-  t.ok(
-    validateRSAA(action4).includes('Invalid [RSAA] key: invalidKey'),
-    '[RSAA] must not have properties other than endpoint, method, types, body, headers, credentials, options and bailout (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action4),
-    '[RSAA] must not have properties other than endpoint, method, types, body, headers, credentials, options and bailout (isValidRSAA)'
-  );
-
-  const action5 = {
-    [RSAA]: {}
-  };
-  t.ok(
-    validateRSAA(action5).includes(
-      '[RSAA] must have an endpoint property',
-      '[RSAA] must have a method property',
-      '[RSAA] must have a types property'
-    ),
-    '[RSAA] must have endpoint, method, and types properties (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action5),
-    '[RSAA] must have endpoint, method, and types properties (isValidRSAA)'
-  );
-
-  const action6 = {
-    [RSAA]: {
-      endpoint: {},
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  t.ok(
-    validateRSAA(action6).includes(
-      '[RSAA].endpoint property must be a string or a function'
-    ),
-    '[RSAA].endpoint must be a string or a function (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action6),
-    '[RSAA].endpoint must be a string or a function (isValidRSAA)'
-  );
-
-  const action7 = {
-    [RSAA]: {
-      endpoint: '',
-      method: {},
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  t.ok(
-    validateRSAA(action7).includes('[RSAA].method property must be a string'),
-    '[RSAA].method property must be a string (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action7),
-    '[RSAA].method property must be a string (isValidRSAA)'
-  );
-
-  const action8 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'InvalidMethod',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  t.ok(
-    validateRSAA(action8).includes('Invalid [RSAA].method: INVALIDMETHOD'),
-    "[RSAA].method must be one of the strings 'GET', 'HEAD', 'POST', 'PUT', 'PATCH' 'DELETE', or 'OPTIONS' (validateRSAA)"
-  );
-  t.notOk(
-    isValidRSAA(action8),
-    "[RSAA].method must be one of the strings 'GET', 'HEAD', 'POST', 'PUT', 'PATCH' 'DELETE', or 'OPTIONS' (isValidRSAA)"
-  );
-
-  const action9 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      headers: ''
-    }
-  };
-  t.ok(
-    validateRSAA(action9).includes(
-      '[RSAA].headers property must be undefined, a plain JavaScript object, or a function'
-    ),
-    '[RSAA].headers property must be undefined, a plain JavaScript object, or a function (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action9),
-    '[RSAA].headers property must be undefined, a plain JavaScript object, or a function (isValidRSAA)'
-  );
-
-  const action10 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      credentials: {}
-    }
-  };
-  t.ok(
-    validateRSAA(action10).includes(
-      '[RSAA].credentials property must be undefined, or a string'
-    ),
-    '[RSAA].credentials property must be undefined or a string (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action10),
-    '[RSAA].credentials property must be undefined or a string (isValidRSAA)'
-  );
-
-  const action11 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      credentials: 'InvalidCredentials'
-    }
-  };
-  t.ok(
-    validateRSAA(action11).includes(
-      'Invalid [RSAA].credentials: InvalidCredentials'
-    ),
-    "[RSAA].credentials property must be one of the string 'omit', 'same-origin', or 'include' (validateRSAA)"
-  );
-  t.notOk(
-    isValidRSAA(action11),
-    "[RSAA].credentials property must be one of the string 'omit', 'same-origin', or 'include' (isValidRSAA)"
-  );
-
-  const action111 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      credentials: 'same-origin'
-    }
-  };
-  t.ok(
-    validateRSAA(action111).length === 0,
-    "[RSAA].credentials property must be one of the string 'omit', 'same-origin', or 'include' (validateRSAA)"
-  );
-  t.ok(
-    isValidRSAA(action111),
-    "[RSAA].credentials property must be one of the string 'omit', 'same-origin', or 'include' (isValidRSAA)"
-  );
-
-  const action12 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      bailout: ''
-    }
-  };
-  t.ok(
-    validateRSAA(action12).includes(
-      '[RSAA].bailout property must be undefined, a boolean, or a function'
-    ),
-    '[RSAA].bailout must be undefined, a boolean, or a function (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action12),
-    '[RSAA].bailout must be undefined, a boolean, or a function (isValidRSAA)'
-  );
-
-  const action13 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: {}
-    }
-  };
-  t.ok(
-    validateRSAA(action13).includes(
-      '[RSAA].types property must be an array of length 3'
-    ),
-    '[RSAA].types property must be an array (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action13),
-    '[RSAA].types property must be an array (isRSAA)'
-  );
-
-  const action14 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['a', 'b']
-    }
-  };
-  t.ok(
-    validateRSAA(action14).includes(
-      '[RSAA].types property must be an array of length 3'
-    ),
-    '[RSAA].types property must have length 3 (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action14),
-    '[RSAA].types property must have length 3 (isRSAA)'
-  );
-
-  const action15 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: [{}, {}, {}]
-    }
-  };
-  t.ok(
-    validateRSAA(action15).includes(
-      'Invalid request type',
-      'Invalid success type',
-      'Invalid failure type'
-    ),
-    'Each element in [RSAA].types property must be a string, a symbol, or a type descriptor (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action15),
-    'Each element in [RSAA].types property must be a string, a symbol, or a type descriptor (isRSAA)'
-  );
-
-  const action16 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  t.equal(
-    validateRSAA(action16).length,
-    0,
-    '[RSAA].endpoint may be a string (validateRSAA)'
-  );
-  t.ok(isValidRSAA(action16), '[RSAA].endpoint may be a string (isValidRSAA)');
-
-  const action17 = {
-    [RSAA]: {
-      endpoint: () => '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  t.equal(
-    validateRSAA(action17).length,
-    0,
-    '[RSAA].endpoint may be a function (validateRSAA)'
-  );
-  t.ok(
-    isValidRSAA(action17),
-    '[RSAA].endpoint may be a function (isValidRSAA)'
-  );
-
-  const action18 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      headers: {}
-    }
-  };
-  t.equal(
-    validateRSAA(action18).length,
-    0,
-    '[RSAA].headers may be a plain JavaScript object (validateRSAA)'
-  );
-  t.ok(
-    isValidRSAA(action18),
-    '[RSAA].headers may be a plain JavaScript object (isRSAA)'
-  );
-
-  const action19 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      headers: () => {}
-    }
-  };
-  t.equal(
-    validateRSAA(action19).length,
-    0,
-    '[RSAA].headers may be a function (validateRSAA)'
-  );
-  t.ok(isValidRSAA(action19), '[RSAA].headers may be a function (isRSAA)');
-
-  const action20 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      bailout: false
-    }
-  };
-  t.equal(
-    validateRSAA(action20).length,
-    0,
-    '[RSAA].bailout may be a boolean (validateRSAA)'
-  );
-  t.ok(isValidRSAA(action20), '[RSAA].bailout may be a boolean (isRSAA)');
-
-  const action21 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      bailout: () => false
-    }
-  };
-  t.equal(
-    validateRSAA(action21).length,
-    0,
-    '[RSAA].bailout may be a function (validateRSAA)'
-  );
-  t.ok(isValidRSAA(action21), '[RSAA].bailout may be a function (isRSAA)');
-
-  const action22 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: [Symbol(), Symbol(), Symbol()]
-    }
-  };
-  t.equal(
-    validateRSAA(action22).length,
-    0,
-    'Each element in [RSAA].types may be a symbol (validateRSAA)'
-  );
-  t.ok(
-    isValidRSAA(action22),
-    'Each element in [RSAA].types may be a symbol (isRSAA)'
-  );
-
-  const action23 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        {
-          type: 'SUCCESS',
-          payload: 'successPayload',
-          meta: 'successMeta'
-        },
-        {
-          type: 'FAILURE',
-          payload: 'failurePayload',
-          meta: 'failureMeta'
-        }
-      ]
-    }
-  };
-  t.equal(
-    validateRSAA(action23).length,
-    0,
-    'Each element in [RSAA].types may be a type descriptor (validateRSAA)'
-  );
-  t.ok(
-    isValidRSAA(action23),
-    'Each element in [RSAA].types may be a type descriptor (isRSAA)'
-  );
-
-  const action24 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      options: ''
-    }
-  };
-  t.ok(
-    validateRSAA(action24).includes(
-      '[RSAA].options property must be undefined, a plain JavaScript object, or a function'
-    ),
-    '[RSAA].options property must be undefined, a plain JavaScript object, or a function (validateRSAA)'
-  );
-  t.notOk(
-    isValidRSAA(action24),
-    '[RSAA].options property must be undefined, a plain JavaScript object, or a function (isValidRSAA)'
-  );
-
-  const action25 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      options: {}
-    }
-  };
-  t.equal(
-    validateRSAA(action25).length,
-    0,
-    '[RSAA].options may be a plain JavaScript object (validateRSAA)'
-  );
-  t.ok(
-    isValidRSAA(action25),
-    '[RSAA].options may be a plain JavaScript object (isRSAA)'
-  );
-
-  const action26 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      options: () => {}
-    }
-  };
-  t.equal(
-    validateRSAA(action26).length,
-    0,
-    '[RSAA].options may be a function (validateRSAA)'
-  );
-  t.ok(isValidRSAA(action26), '[RSAA].options may be a function (isRSAA)');
-
-  const action27 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      fetch: () => {}
-    }
-  };
-  t.ok(
-    isValidRSAA(action27),
-    '[RSAA].fetch property must be a function (isRSAA)'
-  );
-
-  const action28 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      fetch: {}
-    }
-  };
-  t.notOk(
-    isValidRSAA(action28),
-    '[RSAA].fetch property must be a function (isRSAA)'
-  );
-
-  const action29 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      ok: {}
-    }
-  };
-  t.notOk(
-    isValidRSAA(action29),
-    '[RSAA].ok property must be a function (isRSAA)'
-  );
-
-  const action30 = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    },
-    [Symbol('action30 Symbol')]: 'foo'
-  };
-  t.equal(
-    validateRSAA(action30).length,
-    0,
-    'RSAAs may have Symbol properties other than [RSAA] (validateRSAA)'
-  );
-
-  t.end();
-});
-
-test('InvalidRSAA', t => {
-  const validationErrors = ['validation error 1', 'validation error 2'];
-  const error = new InvalidRSAA(validationErrors);
-
-  t.ok(error instanceof Error, 'is an error object');
-  t.equal(error.name, 'InvalidRSAA', 'has correct name property');
-  t.equal(error.message, 'Invalid RSAA', 'has correct message');
-  t.deepEqual(
-    error.validationErrors,
-    validationErrors,
-    'has correct validationErrors property'
-  );
-
-  t.end();
-});
-
-test('InternalError', t => {
-  const error = new InternalError('error thrown in payload function');
-
-  t.ok(error instanceof Error, 'is an error object');
-  t.equal(error.name, 'InternalError', 'has correct name property');
-  t.equal(
-    error.message,
-    'error thrown in payload function',
-    'has correct message'
-  );
-
-  t.end();
-});
-
-test('RequestError', t => {
-  const error = new RequestError('Network request failed');
-
-  t.ok(error instanceof Error, 'is an error object');
-  t.equal(error.name, 'RequestError', 'has correct name property');
-  t.equal(error.message, 'Network request failed', 'has correct message');
-
-  t.end();
-});
-
-test('ApiError', t => {
-  const json = { error: 'Resource not found' };
-  const error = new ApiError(404, 'Not Found', json);
-
-  t.ok(error instanceof Error, 'is an error object');
-  t.equal(error.name, 'ApiError', 'has correct name property');
-  t.equal(error.message, '404 - Not Found', 'has correct message');
-  t.equal(error.status, 404, 'has correct status property');
-  t.equal(error.statusText, 'Not Found', 'has correct statusText property');
-  t.equal(error.response, json, 'has correct response property');
-
-  t.end();
-});
-
-test('getJSON', async t => {
-  const res1 = {
-    headers: {
-      get(name) {
-        return name === 'Content-Type' ? 'application/json' : undefined;
-      }
-    },
-    json() {
-      return Promise.resolve({ message: 'ok' });
-    }
-  };
-  const result1 = await getJSON(res1);
-  t.deepEqual(
-    result1,
-    { message: 'ok' },
-    "returns the JSON body of a response with a JSONy 'Content-Type' header"
-  );
-
-  const res2 = {
-    headers: {
-      get(name) {
-        return;
-      }
-    }
-  };
-  try {
-    const result2 = await getJSON(res2);
-  } catch (e) {
-    t.pass(
-      "returns a rejected promise for a response with a not-JSONy 'Content-Type' header"
-    );
-  }
-
-  t.end();
-});
-
-test('normalizeTypeDescriptors', t => {
-  const types1 = ['REQUEST', 'SUCCESS', 'FAILURE'];
-  const descriptors1 = normalizeTypeDescriptors(types1);
-  t.ok(
-    Array.isArray(descriptors1) && descriptors1.length === 3,
-    'returns an array of length 3'
-  );
-  t.deepEqual(
-    descriptors1[0].type,
-    'REQUEST',
-    'request type has the correct type property'
-  );
-  t.equal(
-    Object.keys(descriptors1[0]).length,
-    1,
-    'request type has no other properties by default'
-  );
-  t.deepEqual(
-    descriptors1[1].type,
-    'SUCCESS',
-    'success type has the correct type property'
-  );
-  t.ok(
-    'payload' in descriptors1[1],
-    'success type has a payload property by default'
-  );
-  t.equal(
-    Object.keys(descriptors1[1]).length,
-    2,
-    'success type has no other properties by default'
-  );
-  t.deepEqual(
-    descriptors1[2].type,
-    'FAILURE',
-    'failure type has the correct type property'
-  );
-  t.ok(
-    'payload' in descriptors1[2],
-    'failure type has a payload property by default'
-  );
-  t.equal(
-    Object.keys(descriptors1[2]).length,
-    2,
-    'failure type has no other properties by default'
-  );
-
-  const types2 = [
-    {
-      type: 'REQUEST',
-      payload: 'requestPayload',
-      meta: 'requestMeta'
-    },
-    {
-      type: 'SUCCESS',
-      payload: 'successPayload',
-      meta: 'successMeta'
-    },
-    {
-      type: 'FAILURE',
-      payload: 'failurePayload',
-      meta: 'failureMeta'
-    }
-  ];
-  const descriptors2 = normalizeTypeDescriptors(types2);
-  t.equal(
-    descriptors2[0].payload,
-    'requestPayload',
-    'request type must accept a custom payload property'
-  );
-  t.equal(
-    descriptors2[0].meta,
-    'requestMeta',
-    'request type must accept a custom meta property'
-  );
-  t.equal(
-    descriptors2[1].payload,
-    'successPayload',
-    'success type must accept a custom payload property'
-  );
-  t.equal(
-    descriptors2[1].meta,
-    'successMeta',
-    'success type must accept a custom meta property'
-  );
-  t.equal(
-    descriptors2[2].payload,
-    'failurePayload',
-    'failure type must accept a custom payload property'
-  );
-  t.equal(
-    descriptors2[2].meta,
-    'failureMeta',
-    'failure type must accept a custom meta property'
-  );
-
-  t.end();
-});
-
-test('actionWith', async t => {
-  const descriptor1 = {
-    type: 'REQUEST',
-    payload: 'somePayload',
-    meta: 'someMeta',
-    error: true
-  };
-  const fsa1 = await actionWith(descriptor1);
-  t.equal(
-    fsa1.type,
-    'REQUEST',
-    'must set FSA type property to incoming descriptor type property'
-  );
-  t.equal(
-    fsa1.payload,
-    'somePayload',
-    'must set FSA payload property to incoming descriptor payload property'
-  );
-  t.equal(
-    fsa1.meta,
-    'someMeta',
-    'must set FSA meta property to incoming descriptor meta property'
-  );
-  t.ok(
-    fsa1.error,
-    'must set FSA error property to incoming descriptor error property'
-  );
-
-  const passedArgs = ['action', 'state', 'res'];
-  const descriptor2 = {
-    type: 'REQUEST',
-    payload: (...args) => {
-      t.pass('must call a payload function');
-      t.deepEqual(
-        args,
-        passedArgs,
-        'payload function must receive its arguments'
-      );
-    },
-    meta: (...args) => {
-      t.pass('must call a meta function');
-      t.deepEqual(args, passedArgs, 'meta function must receive its arguments');
-    }
-  };
-  const fsa2 = await actionWith(descriptor2, passedArgs);
-
-  const descriptor3 = {
-    type: 'REQUEST',
-    payload: (...args) => {
-      throw new Error('error in payload function');
-    }
-  };
-  const fsa3 = await actionWith(descriptor3, passedArgs);
-  t.equal(
-    fsa3.payload.message,
-    'error in payload function',
-    'must set FSA payload property to an error if a custom payload function throws'
-  );
-  t.ok(
-    fsa3.error,
-    'must set FSA error property to true if a custom payload function throws'
-  );
-
-  const descriptor4 = {
-    type: 'REQUEST',
-    meta: (...args) => {
-      throw new Error('error in meta function');
-    }
-  };
-  const fsa4 = await actionWith(descriptor4, passedArgs);
-  t.equal(
-    fsa4.payload.message,
-    'error in meta function',
-    'must set FSA payload property to an error if a custom meta function throws'
-  );
-  t.ok(
-    fsa4.error,
-    'must set FSA error property to true if a custom meta function throws'
-  );
-
-  const descriptor5 = {
-    type: 'REQUEST',
-    payload: () => 'somePayload',
-    meta: () => new Promise(resolve => setTimeout(() => resolve('someMeta'), 250)),
-    error: true
-  };
-  const fsa5 = await actionWith(descriptor5);
-  t.equal(
-    fsa5.type,
-    'REQUEST',
-    'must set FSA type property to incoming descriptor type property'
-  );
-  t.equal(
-    fsa5.payload,
-    'somePayload',
-    'must set FSA payload property to incoming descriptor payload property'
-  );
-  t.equal(
-    fsa5.meta,
-    'someMeta',
-    'must set FSA meta property to incoming descriptor meta property'
-  );
-  t.ok(
-    fsa5.error,
-    'must set FSA error property to incoming descriptor error property'
-  );
-
-  t.end();
-});
-
-test('createMiddleware must return a Redux middleware', t => {
-  const doGetState = () => {};
-  const middleware = createMiddleware();
-  const nextHandler = middleware({ getState: doGetState });
-  const doNext = () => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.equal(middleware.length, 1, 'apiMiddleware must take one argument');
-
-  t.equal(
-    typeof nextHandler,
-    'function',
-    'apiMiddleware must return a function to handle next'
-  );
-
-  t.equal(nextHandler.length, 1, 'next handler must take one argument');
-
-  t.equal(
-    typeof actionHandler,
-    'function',
-    'next handler must return a function to handle action'
-  );
-
-  t.equal(actionHandler.length, 1, 'action handler must take one argument');
-
-  t.end();
-});
-
-test('apiMiddleware must be a Redux middleware', t => {
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = () => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.equal(apiMiddleware.length, 1, 'apiMiddleware must take one argument');
-
-  t.equal(
-    typeof nextHandler,
-    'function',
-    'apiMiddleware must return a function to handle next'
-  );
-
-  t.equal(nextHandler.length, 1, 'next handler must take one argument');
-
-  t.equal(
-    typeof actionHandler,
-    'function',
-    'next handler must return a function to handle action'
-  );
-
-  t.equal(actionHandler.length, 1, 'action handler must take one argument');
-
-  t.end();
-});
-
-test('apiMiddleware must pass actions without an [RSAA] property to the next handler', t => {
-  const anAction = {};
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(anAction, action, 'original action passed to the next handler');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(2);
-  actionHandler(anAction);
-});
-
-test("apiMiddleware mustn't return a promise on actions without a [RSAA] property", t => {
-  const anAction = {};
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => action;
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  const noProm = actionHandler(anAction);
-  t.notEqual(typeof noProm.then, 'function', 'no promise returned');
-});
-
-test('apiMiddleware must return a promise on actions with a [RSAA] property', t => {
-  const anAction = { [RSAA]: {} };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => action;
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  const yesProm = actionHandler(anAction);
-  t.equal(typeof yesProm.then, 'function', 'promise returned');
-});
-
-test('apiMiddleware must dispatch an error request FSA for an invalid RSAA with a string request type', t => {
-  const anAction = {
-    [RSAA]: {
-      types: ['REQUEST']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.name,
-      'InvalidRSAA',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(action.meta, undefined, 'dispatched FSA has no meta property');
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch an error request FSA for an invalid RSAA with a descriptor request type', t => {
-  const anAction = {
-    [RSAA]: {
-      types: [
-        {
-          type: 'REQUEST'
-        }
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.name,
-      'InvalidRSAA',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(action.meta, undefined, 'dispatched FSA has no meta property');
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must do nothing for an invalid RSAA without a request type', t => {
-  const anAction = {
-    [RSAA]: {}
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.fail('next handler called');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  actionHandler(anAction);
-  setTimeout(() => {
-    t.pass('next handler not called');
-    t.end();
-  }, 200);
-});
-
-test('apiMiddleware must dispatch an error request FSA when [RSAA].bailout fails', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      bailout: () => {
-        throw new Error();
-      },
-      types: [
-        {
-          type: 'REQUEST',
-          payload: () => 'ignoredPayload',
-          meta: () => 'someMeta'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.message,
-      '[RSAA].bailout function failed',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(
-      action.meta,
-      'someMeta',
-      'dispatched FSA has correct meta property'
-    );
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch an error request FSA when [RSAA].body fails', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      body: () => {
-        throw new Error();
-      },
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'ignoredPayload',
-          meta: 'someMeta'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.message,
-      '[RSAA].body function failed',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(
-      action.meta,
-      'someMeta',
-      'dispatched FSA has correct meta property'
-    );
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch an error request FSA when [RSAA].endpoint fails', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: () => {
-        throw new Error();
-      },
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'ignoredPayload',
-          meta: 'someMeta'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.message,
-      '[RSAA].endpoint function failed',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(
-      action.meta,
-      'someMeta',
-      'dispatched FSA has correct meta property'
-    );
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch an error request FSA when [RSAA].headers fails', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      headers: () => {
-        throw new Error();
-      },
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'ignoredPayload',
-          meta: 'someMeta'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.message,
-      '[RSAA].headers function failed',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(
-      action.meta,
-      'someMeta',
-      'dispatched FSA has correct meta property'
-    );
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch an error request FSA when [RSAA].options fails', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: '',
-      method: 'GET',
-      options: () => {
-        throw new Error();
-      },
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'ignoredPayload',
-          meta: 'someMeta'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.pass('next handler called');
-    t.equal(action.type, 'REQUEST', 'dispatched FSA has correct type property');
-    t.equal(
-      action.payload.message,
-      '[RSAA].options function failed',
-      'dispatched FSA has correct payload property'
-    );
-    t.equal(
-      action.meta,
-      'someMeta',
-      'dispatched FSA has correct meta property'
-    );
-    t.ok(action.error, 'dispatched FSA has correct error property');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(5);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a failure FSA when [RSAA].ok fails', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      ok: () => {
-        throw new Error();
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('next handler called');
-        break;
-      case 'SUCCESS':
-        t.fail('success action should not be dispatched');
-        break;
-      case 'FAILURE':
-        t.equal(
-          action.payload.message,
-          '[RSAA].ok function failed',
-          'dispatched FSA has correct payload property'
-        );
-        t.ok(action.error, 'dispatched FSA has correct error property');
-        break;
-    }
-  };
-
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(3);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a failure FSA with an error on a request error', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1', // We haven't mocked this
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'ignoredPayload',
-          meta: 'someMeta'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        if (action.error) {
-          t.fail('Request FSA should not have an error');
-        } else {
-          t.pass('next handler called');
-          t.equal(
-            action.type,
-            'REQUEST',
-            'dispatched non-error FSA has correct type property'
-          );
-          t.equal(
-            action.payload,
-            'ignoredPayload',
-            'dispatched non-error FSA has correct payload property'
-          );
-          t.equal(
-            action.meta,
-            'someMeta',
-            'dispatched non-error FSA has correct meta property'
-          );
-          t.notOk(
-            action.error,
-            'dispatched non-error FSA has correct error property'
-          );
-        }
-        break;
-      case 'FAILURE':
-        t.equal(
-          action.type,
-          'FAILURE',
-          'dispatched error FSA has correct type property'
-        );
-        t.equal(
-          action.payload.name,
-          'RequestError',
-          'dispatched error FSA has correct payload property'
-        );
-        t.ok(action.error, 'dispatched error FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use an [RSAA].bailout boolean when present', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      bailout: true
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.fail('next handler called');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  actionHandler(anAction);
-  setTimeout(() => {
-    t.pass('next handler not called');
-    t.end();
-  }, 200);
-});
-
-test('apiMiddleware must use an [RSAA].bailout function when present', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE'],
-      bailout: () => {
-        t.pass('[RSAA].bailout function called');
-        return true;
-      }
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    t.fail('next handler called');
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use an [RSAA].body function when present', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      body: () => {
-        t.pass('[RSAA].body function called');
-        return 'body';
-      },
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use an [RSAA].endpoint function when present', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: () => {
-        t.pass('[RSAA].endpoint function called');
-        return 'http://127.0.0.1/api/users/1';
-      },
-      method: 'GET',
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use an [RSAA].headers function when present', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      headers: () => {
-        t.pass('[RSAA].headers function called');
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use an [RSAA].options function when present', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      options: () => {
-        t.pass('[RSAA].options function called');
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use an [RSAA].ok function when present', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      ok: () => {
-        t.pass('[RSAA].ok function called');
-        return true;
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {};
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(1);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a failure FSA when [RSAA].ok returns false on a successful request', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      ok: () => {
-        return false;
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('next handler called');
-        break;
-      case 'SUCCESS':
-        t.fail('success action should not be dispatched');
-        break;
-      case 'FAILURE':
-        t.ok(action.error, 'dispatched FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(2);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use a [RSAA].fetch custom fetch wrapper when present', t => {
-  const asyncWorker = async () => 'Done!';
-  const responseBody = {
-    id: 1,
-    name: 'Alan',
-    error: false
-  };
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200, responseBody);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      fetch: async (endpoint, opts) => {
-        t.pass('custom fetch handler called');
-
-        // Simulate some async process like retrieving cache
-        await asyncWorker();
-
-        const res = await fetch(endpoint, opts);
-        const json = await res.json();
-
-        return new Response(
-          JSON.stringify({
-            ...json,
-            foo: 'bar'
-          }),
-          {
-            // Example of custom `res.ok`
-            status: json.error ? 500 : 200,
-            headers: {
-              'Content-Type': 'application/json'
-            }
-          }
-        );
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'SUCCESS':
-        t.deepEqual(
-          action.payload,
-          {
-            ...responseBody,
-            foo: 'bar'
-          },
-          'custom response passed to the next handler'
-        );
-        break;
-    }
-  };
-
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(2);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch correct error payload when custom fetch wrapper returns an error response', t => {
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      fetch: async (endpoint, opts) => {
-        return new Response(
-          JSON.stringify({
-            foo: 'bar'
-          }),
-          {
-            status: 500,
-            headers: {
-              'Content-Type': 'application/json'
-            }
-          }
-        );
-      },
-      types: ['REQUEST', 'SUCCESS', 'FAILURE']
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'FAILURE':
-        t.ok(action.payload instanceof Error);
-        t.pass('error action dispatched');
-        t.deepEqual(
-          action.payload.response,
-          {
-            foo: 'bar'
-          },
-          'custom response passed to the next handler'
-        );
-        break;
-    }
-  };
-
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(3);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use payload property of request type descriptor when it is a function', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const expectedState = { foo: 'bar' };
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          meta: 'requestMeta',
-          payload: (action, state) => {
-            t.pass('request type descriptor payload function has been called');
-            t.equal(
-              action,
-              anAction,
-              'request type descriptor payload function has been called with correct action parameter'
-            );
-            t.equal(
-              state,
-              expectedState,
-              'request type descriptor payload function has been called with correct state parameter'
-            );
-            return 'requestPayload';
-          }
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {
-    return expectedState;
-  };
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    if (action.type === 'REQUEST') {
-      t.pass('request FSA passed to the next handler');
-      t.equal(
-        action.meta,
-        'requestMeta',
-        'request FSA has correct meta property'
-      );
-      t.equal(
-        action.payload,
-        'requestPayload',
-        'request FSA has correct payload property'
-      );
-      t.notOk(action.error, 'request FSA has correct error property');
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(7);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must use meta property of request type descriptor when it is a function', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const expectedState = { foo: 'bar' };
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          meta: (action, state) => {
-            t.pass('request type descriptor meta function has been called');
-            t.equal(
-              action,
-              anAction,
-              'request type descriptor meta function has been called with correct action parameter'
-            );
-            t.equal(
-              state,
-              expectedState,
-              'request type descriptor meta function has been called with correct state parameter'
-            );
-            return 'requestMeta';
-          },
-          payload: 'requestPayload'
-        },
-        'SUCCESS',
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {
-    return expectedState;
-  };
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    if (action.type === 'REQUEST') {
-      t.pass('request FSA passed to the next handler');
-      t.equal(
-        action.meta,
-        'requestMeta',
-        'request FSA has correct meta property'
-      );
-      t.equal(
-        action.payload,
-        'requestPayload',
-        'request FSA has correct payload property'
-      );
-      t.notOk(action.error, 'request FSA has correct error property');
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(7);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a success FSA on a successful API call with a non-empty JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200, { username: 'Alice' }, { 'Content-Type': 'application/json' });
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        {
-          type: 'SUCCESS',
-          meta: 'successMeta'
-        },
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'SUCCESS':
-        t.pass('success FSA passed to the next handler');
-        t.deepEqual(
-          action.payload,
-          { username: 'Alice' },
-          'success FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'successMeta',
-          'success FSA has correct meta property'
-        );
-        t.notOk(action.error, 'success FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a success FSA on a successful API call with an empty JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200, {}, { 'Content-Type': 'application/json' });
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        {
-          type: 'SUCCESS',
-          meta: 'successMeta'
-        },
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'SUCCESS':
-        t.pass('success FSA passed to the next handler');
-        t.deepEqual(
-          action.payload,
-          {},
-          'success FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'successMeta',
-          'success FSA has correct meta property'
-        );
-        t.notOk(action.error, 'success FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a success FSA with an error state on a successful API call with an invalid JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200, '', { 'Content-Type': 'application/json' });
-
-  const error = new InternalError('Expected error - simulating invalid JSON');
-
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        {
-          type: 'SUCCESS',
-          meta: 'successMeta',
-          payload: () => {
-            throw error;
-          }
-        },
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'SUCCESS':
-        t.pass('success FSA passed to the next handler');
-        t.deepEqual(
-          action.payload,
-          error,
-          'success FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'successMeta',
-          'success FSA has correct meta property'
-        );
-        t.ok(action.error, 'success FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a success FSA on a successful API call with a non-JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(200);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        {
-          type: 'SUCCESS',
-          meta: 'successMeta'
-        },
-        'FAILURE'
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'SUCCESS':
-        t.pass('success FSA passed to the next handler');
-        t.deepEqual(
-          typeof action.payload,
-          'undefined',
-          'success FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'successMeta',
-          'success FSA has correct meta property'
-        );
-        t.notOk(action.error, 'success FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-empty JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(
-      404,
-      { error: 'Resource not found' },
-      { 'Content-Type': 'application/json' }
-    );
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        'SUCCESS',
-        {
-          type: 'FAILURE',
-          meta: 'failureMeta'
-        }
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'FAILURE':
-        t.pass('failure FSA passed to the next handler');
-        t.deepEqual(
-          action.payload.response,
-          { error: 'Resource not found' },
-          'failure FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'failureMeta',
-          'failure FSA has correct meta property'
-        );
-        t.ok(action.error, 'failure FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a failure FSA on an unsuccessful API call with an empty JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(404, {}, { 'Content-Type': 'application/json' });
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        'SUCCESS',
-        {
-          type: 'FAILURE',
-          meta: 'failureMeta'
-        }
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'FAILURE':
-        t.pass('failure FSA passed to the next handler');
-        t.deepEqual(
-          action.payload.response,
-          {},
-          'failure FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'failureMeta',
-          'failure FSA has correct meta property'
-        );
-        t.ok(action.error, 'failure FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
-
-test('apiMiddleware must dispatch a failure FSA on an unsuccessful API call with a non-JSON response', t => {
-  const api = nock('http://127.0.0.1')
-    .get('/api/users/1')
-    .reply(404);
-  const anAction = {
-    [RSAA]: {
-      endpoint: 'http://127.0.0.1/api/users/1',
-      method: 'GET',
-      types: [
-        {
-          type: 'REQUEST',
-          payload: 'requestPayload',
-          meta: 'requestMeta'
-        },
-        'SUCCESS',
-        {
-          type: 'FAILURE',
-          meta: 'failureMeta'
-        }
-      ]
-    }
-  };
-  const doGetState = () => {};
-  const nextHandler = apiMiddleware({ getState: doGetState });
-  const doNext = action => {
-    switch (action.type) {
-      case 'REQUEST':
-        t.pass('request FSA passed to the next handler');
-        t.equal(
-          action.payload,
-          'requestPayload',
-          'request FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'requestMeta',
-          'request FSA has correct meta property'
-        );
-        t.notOk(action.error, 'request FSA has correct error property');
-        break;
-      case 'FAILURE':
-        t.pass('failure FSA passed to the next handler');
-        t.deepEqual(
-          typeof action.payload.response,
-          'undefined',
-          'failure FSA has correct payload property'
-        );
-        t.equal(
-          action.meta,
-          'failureMeta',
-          'failure FSA has correct meta property'
-        );
-        t.ok(action.error, 'failure FSA has correct error property');
-        break;
-    }
-  };
-  const actionHandler = nextHandler(doNext);
-
-  t.plan(8);
-  actionHandler(anAction);
-});
diff --git a/test/setupJest.js b/test/setupJest.js
new file mode 100644
index 0000000..2b6260b
--- /dev/null
+++ b/test/setupJest.js
@@ -0,0 +1 @@
+global.fetch = require('jest-fetch-mock')