diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..c89d4ff
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,4 @@
+module.exports = {
+  testEnvironment: 'node',
+  snapshotResolver: './test/helpers/snapshotResolver.js',
+};
diff --git a/package-lock.json b/package-lock.json
index dea3f8c..7a51684 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,6 +21,22 @@
         "source-map": "^0.5.0"
       },
       "dependencies": {
+        "make-dir": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+          "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+          "dev": true,
+          "requires": {
+            "pify": "^4.0.1",
+            "semver": "^5.6.0"
+          }
+        },
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -47,6 +63,14 @@
         "browserslist": "^4.12.0",
         "invariant": "^2.2.4",
         "semver": "^5.5.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        }
       }
     },
     "@babel/core": {
@@ -88,6 +112,12 @@
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           "dev": true
         },
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -145,6 +175,14 @@
         "invariant": "^2.2.4",
         "levenary": "^1.1.1",
         "semver": "^5.5.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        }
       }
     },
     "@babel/helper-create-class-features-plugin": {
@@ -982,6 +1020,14 @@
         "invariant": "^2.2.2",
         "levenary": "^1.1.1",
         "semver": "^5.5.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        }
       }
     },
     "@babel/preset-modules": {
@@ -1527,15 +1573,16 @@
       "dev": true
     },
     "@jest/console": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/@jest/console/-/console-26.1.0.tgz",
-      "integrity": "sha512-+0lpTHMd/8pJp+Nd4lyip+/Iyf2dZJvcCqrlkeZQoQid+JlThA4M9vxHtheyrQ99jJTMQam+es4BcvZ5W5cC3A==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/console/-/console-26.2.0.tgz",
+      "integrity": "sha512-mXQfx3nSLwiHm1i7jbu+uvi+vvpVjNGzIQYLCfsat9rapC+MJkS4zBseNrgJE0vU921b3P67bQzhduphjY3Tig==",
       "dev": true,
       "requires": {
-        "@jest/types": "^26.1.0",
+        "@jest/types": "^26.2.0",
+        "@types/node": "*",
         "chalk": "^4.0.0",
-        "jest-message-util": "^26.1.0",
-        "jest-util": "^26.1.0",
+        "jest-message-util": "^26.2.0",
+        "jest-util": "^26.2.0",
         "slash": "^3.0.0"
       },
       "dependencies": {
@@ -1598,33 +1645,34 @@
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     },
     "@jest/core": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/@jest/core/-/core-26.1.0.tgz",
-      "integrity": "sha512-zyizYmDJOOVke4OO/De//aiv8b07OwZzL2cfsvWF3q9YssfpcKfcnZAwDY8f+A76xXSMMYe8i/f/LPocLlByfw==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/core/-/core-26.2.0.tgz",
+      "integrity": "sha512-btXHfHuCR9BZJcXTu+iNjUSGfRYo28aVLMXL8B/gcDPypAvaQ+NXPJSLljhRIBGSzcBz3CLE/jQf2NyfwXiLNA==",
       "dev": true,
       "requires": {
-        "@jest/console": "^26.1.0",
-        "@jest/reporters": "^26.1.0",
-        "@jest/test-result": "^26.1.0",
-        "@jest/transform": "^26.1.0",
-        "@jest/types": "^26.1.0",
+        "@jest/console": "^26.2.0",
+        "@jest/reporters": "^26.2.0",
+        "@jest/test-result": "^26.2.0",
+        "@jest/transform": "^26.2.0",
+        "@jest/types": "^26.2.0",
+        "@types/node": "*",
         "ansi-escapes": "^4.2.1",
         "chalk": "^4.0.0",
         "exit": "^0.1.2",
         "graceful-fs": "^4.2.4",
-        "jest-changed-files": "^26.1.0",
-        "jest-config": "^26.1.0",
-        "jest-haste-map": "^26.1.0",
-        "jest-message-util": "^26.1.0",
+        "jest-changed-files": "^26.2.0",
+        "jest-config": "^26.2.0",
+        "jest-haste-map": "^26.2.0",
+        "jest-message-util": "^26.2.0",
         "jest-regex-util": "^26.0.0",
-        "jest-resolve": "^26.1.0",
-        "jest-resolve-dependencies": "^26.1.0",
-        "jest-runner": "^26.1.0",
-        "jest-runtime": "^26.1.0",
-        "jest-snapshot": "^26.1.0",
-        "jest-util": "^26.1.0",
-        "jest-validate": "^26.1.0",
-        "jest-watcher": "^26.1.0",
+        "jest-resolve": "^26.2.0",
+        "jest-resolve-dependencies": "^26.2.0",
+        "jest-runner": "^26.2.0",
+        "jest-runtime": "^26.2.0",
+        "jest-snapshot": "^26.2.0",
+        "jest-util": "^26.2.0",
+        "jest-validate": "^26.2.0",
+        "jest-watcher": "^26.2.0",
         "micromatch": "^4.0.2",
         "p-each-series": "^2.1.0",
         "rimraf": "^3.0.0",
@@ -1749,51 +1797,53 @@
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-      "resolved": "https://registry.npmjs.org/@jest/environment/-/environment-26.1.0.tgz",
-      "integrity": "sha512-86+DNcGongbX7ai/KE/S3/NcUVZfrwvFzOOWX/W+OOTvTds7j07LtC+MgGydH5c8Ri3uIrvdmVgd1xFD5zt/xA==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/environment/-/environment-26.2.0.tgz",
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       "dev": true,
       "requires": {
-        "@jest/fake-timers": "^26.1.0",
-        "@jest/types": "^26.1.0",
-        "jest-mock": "^26.1.0"
+        "@jest/fake-timers": "^26.2.0",
+        "@jest/types": "^26.2.0",
+        "@types/node": "*",
+        "jest-mock": "^26.2.0"
       }
     },
     "@jest/fake-timers": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-26.1.0.tgz",
-      "integrity": "sha512-Y5F3kBVWxhau3TJ825iuWy++BAuQzK/xEa+wD9vDH3RytW9f2DbMVodfUQC54rZDX3POqdxCgcKdgcOL0rYUpA==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/fake-timers/-/fake-timers-26.2.0.tgz",
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       "dev": true,
       "requires": {
-        "@jest/types": "^26.1.0",
+        "@jest/types": "^26.2.0",
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-        "jest-message-util": "^26.1.0",
-        "jest-mock": "^26.1.0",
-        "jest-util": "^26.1.0"
+        "@types/node": "*",
+        "jest-message-util": "^26.2.0",
+        "jest-mock": "^26.2.0",
+        "jest-util": "^26.2.0"
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     "@jest/globals": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/@jest/globals/-/globals-26.1.0.tgz",
-      "integrity": "sha512-MKiHPNaT+ZoG85oMaYUmGHEqu98y3WO2yeIDJrs2sJqHhYOy3Z6F7F/luzFomRQ8SQ1wEkmahFAz2291Iv8EAw==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/globals/-/globals-26.2.0.tgz",
+      "integrity": "sha512-Hoc6ScEIPaym7RNytIL2ILSUWIGKlwEv+JNFof9dGYOdvPjb2evEURSslvCMkNuNg1ECEClTE8PH7ULlMJntYA==",
       "dev": true,
       "requires": {
-        "@jest/environment": "^26.1.0",
-        "@jest/types": "^26.1.0",
-        "expect": "^26.1.0"
+        "@jest/environment": "^26.2.0",
+        "@jest/types": "^26.2.0",
+        "expect": "^26.2.0"
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     "@jest/reporters": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/@jest/reporters/-/reporters-26.1.0.tgz",
-      "integrity": "sha512-SVAysur9FOIojJbF4wLP0TybmqwDkdnFxHSPzHMMIYyBtldCW9gG+Q5xWjpMFyErDiwlRuPyMSJSU64A67Pazg==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/reporters/-/reporters-26.2.0.tgz",
+      "integrity": "sha512-WOzZLmPBXhrAaIYk+koLIhY9IJVgVW22VJKKUAaRIYMyWRnafbKO+32aPDNWpAsVzzsqGKnYpKO1Q3ZIC7TouA==",
       "dev": true,
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-        "@jest/test-result": "^26.1.0",
-        "@jest/transform": "^26.1.0",
-        "@jest/types": "^26.1.0",
+        "@jest/console": "^26.2.0",
+        "@jest/test-result": "^26.2.0",
+        "@jest/transform": "^26.2.0",
+        "@jest/types": "^26.2.0",
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@@ -1804,10 +1854,10 @@
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         "istanbul-reports": "^3.0.2",
-        "jest-haste-map": "^26.1.0",
-        "jest-resolve": "^26.1.0",
-        "jest-util": "^26.1.0",
-        "jest-worker": "^26.1.0",
+        "jest-haste-map": "^26.2.0",
+        "jest-resolve": "^26.2.0",
+        "jest-util": "^26.2.0",
+        "jest-worker": "^26.2.0",
         "node-notifier": "^7.0.0",
         "slash": "^3.0.0",
         "source-map": "^0.6.0",
@@ -1894,46 +1944,46 @@
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-      "resolved": "https://registry.npmjs.org/@jest/test-result/-/test-result-26.1.0.tgz",
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+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/test-result/-/test-result-26.2.0.tgz",
+      "integrity": "sha512-kgPlmcVafpmfyQEu36HClK+CWI6wIaAWDHNxfQtGuKsgoa2uQAYdlxjMDBEa3CvI40+2U3v36gQF6oZBkoKatw==",
       "dev": true,
       "requires": {
-        "@jest/console": "^26.1.0",
-        "@jest/types": "^26.1.0",
+        "@jest/console": "^26.2.0",
+        "@jest/types": "^26.2.0",
         "@types/istanbul-lib-coverage": "^2.0.0",
         "collect-v8-coverage": "^1.0.0"
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     "@jest/test-sequencer": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/@jest/test-sequencer/-/test-sequencer-26.1.0.tgz",
-      "integrity": "sha512-Z/hcK+rTq56E6sBwMoQhSRDVjqrGtj1y14e2bIgcowARaIE1SgOanwx6gvY4Q9gTKMoZQXbXvptji+q5GYxa6Q==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/test-sequencer/-/test-sequencer-26.2.0.tgz",
+      "integrity": "sha512-xix2i2B9glWgUliCnm8HApVDw8FWs/WlH4OnGvtIoxrcZLUl4mY9U2NxcGf8NDUC0LMeqW/AtIvtgX2JRRbXUQ==",
       "dev": true,
       "requires": {
-        "@jest/test-result": "^26.1.0",
+        "@jest/test-result": "^26.2.0",
         "graceful-fs": "^4.2.4",
-        "jest-haste-map": "^26.1.0",
-        "jest-runner": "^26.1.0",
-        "jest-runtime": "^26.1.0"
+        "jest-haste-map": "^26.2.0",
+        "jest-runner": "^26.2.0",
+        "jest-runtime": "^26.2.0"
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-      "resolved": "https://registry.npmjs.org/@jest/transform/-/transform-26.1.0.tgz",
-      "integrity": "sha512-ICPm6sUXmZJieq45ix28k0s+d/z2E8CHDsq+WwtWI6kW8m7I8kPqarSEcUN86entHQ570ZBRci5OWaKL0wlAWw==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/transform/-/transform-26.2.0.tgz",
+      "integrity": "sha512-6uh4QiC5ldGKpTCbSGHMgiFA4AzzjFvcZIYPah62gO1PxD7zAzOyjTpKi9S1Qw3p23kwQbb+zRjFBNjCdfvn3g==",
       "dev": true,
       "requires": {
         "@babel/core": "^7.1.0",
-        "@jest/types": "^26.1.0",
+        "@jest/types": "^26.2.0",
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         "chalk": "^4.0.0",
         "convert-source-map": "^1.4.0",
         "fast-json-stable-stringify": "^2.0.0",
         "graceful-fs": "^4.2.4",
-        "jest-haste-map": "^26.1.0",
+        "jest-haste-map": "^26.2.0",
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-        "jest-util": "^26.1.0",
+        "jest-util": "^26.2.0",
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         "pirates": "^4.0.1",
         "slash": "^3.0.0",
@@ -2043,13 +2093,14 @@
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-      "resolved": "https://registry.npmjs.org/@jest/types/-/types-26.1.0.tgz",
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+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/@jest/types/-/types-26.2.0.tgz",
+      "integrity": "sha512-lvm3rJvctxd7+wxKSxxbzpDbr4FXDLaC57WEKdUIZ2cjTYuxYSc0zlyD7Z4Uqr5VdKxRUrtwIkiqBuvgf8uKJA==",
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       "requires": {
         "@types/istanbul-lib-coverage": "^2.0.0",
         "@types/istanbul-reports": "^1.1.1",
+        "@types/node": "*",
         "@types/yargs": "^15.0.0",
         "chalk": "^4.0.0"
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@@ -2138,13 +2189,6 @@
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-        }
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     "@sinonjs/commons": {
@@ -2280,10 +2324,9 @@
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-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.26.tgz",
-      "integrity": "sha512-W+fpe5s91FBGE0pEa0lnqGLL4USgpLgs4nokw16SrBBco/gQxuua7KnArSEOd5iaMqbbSHV10vUDkJYJJqpXKA==",
-      "dev": true
+      "version": "14.0.27",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.27.tgz",
+      "integrity": "sha512-kVrqXhbclHNHGu9ztnAwSncIgJv/FaxmzXJvGXNdcCpV1b8u1/Mi6z6m0vwy0LzKeXFTPLH0NzwmoJ3fNCIq0g=="
     },
     "@types/normalize-package-data": {
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@@ -2633,9 +2676,9 @@
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-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.5.1.tgz",
-      "integrity": "sha512-KWcq3xN8fDjSB+IMoh2VaXVhRI0BBGxoYp3rx7Pkb6z0cFjYR9Q9l4yZqqals0/zsioCmocC5H6UvsGD4MoIBA=="
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.5.2.tgz",
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     },
     "alphanum-sort": {
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@@ -2954,16 +2997,16 @@
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-      "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-26.1.0.tgz",
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+      "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-26.2.0.tgz",
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       "dev": true,
       "requires": {
-        "@jest/transform": "^26.1.0",
-        "@jest/types": "^26.1.0",
+        "@jest/transform": "^26.2.0",
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-        "babel-preset-jest": "^26.1.0",
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-          "dev": true,
-          "requires": {
-            "p-limit": "^1.1.0"
-          }
-        },
-        "p-try": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/p-try/-/p-try-1.0.0.tgz",
-          "integrity": "sha1-y8ec26+P1CKOE/Yh8rGiN8GyB7M=",
-          "dev": true
-        },
-        "path-exists": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
-          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
-          "dev": true
-        }
+        "find-up": "^4.0.0"
       }
     },
     "please-upgrade-node": {
@@ -13089,12 +13192,12 @@
       "dev": true
     },
     "pretty-format": {
-      "version": "26.1.0",
-      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-26.1.0.tgz",
-      "integrity": "sha512-GmeO1PEYdM+non4BKCj+XsPJjFOJIPnsLewqhDVoqY1xo0yNmDas7tC2XwpMrRAHR3MaE2hPo37deX5OisJ2Wg==",
+      "version": "26.2.0",
+      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-26.2.0.tgz",
+      "integrity": "sha512-qi/8IuBu2clY9G7qCXgCdD1Bf9w+sXakdHTRToknzMtVy0g7c4MBWaZy7MfB7ndKZovRO6XRwJiAYqq+MC7SDA==",
       "dev": true,
       "requires": {
-        "@jest/types": "^26.1.0",
+        "@jest/types": "^26.2.0",
         "ansi-regex": "^5.0.0",
         "ansi-styles": "^4.0.0",
         "react-is": "^16.12.0"
@@ -13400,6 +13503,14 @@
         "safe-buffer": "~5.1.1",
         "string_decoder": "~1.1.1",
         "util-deprecate": "~1.0.1"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+          "dev": true
+        }
       }
     },
     "readdirp": {
@@ -13778,9 +13889,9 @@
       }
     },
     "safe-buffer": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
-      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
     },
     "safe-regex": {
       "version": "1.1.0",
@@ -13868,6 +13979,15 @@
             "path-exists": "^3.0.0"
           }
         },
+        "p-limit": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
         "p-locate": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
@@ -13875,17 +13995,6 @@
           "dev": true,
           "requires": {
             "p-limit": "^2.0.0"
-          },
-          "dependencies": {
-            "p-limit": {
-              "version": "2.3.0",
-              "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
-              "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
-              "dev": true,
-              "requires": {
-                "p-try": "^2.0.0"
-              }
-            }
           }
         },
         "path-exists": {
@@ -14022,10 +14131,9 @@
       }
     },
     "semver": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
-      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
-      "dev": true
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+      "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
     },
     "semver-compare": {
       "version": "1.0.0",
@@ -14694,6 +14802,14 @@
       "dev": true,
       "requires": {
         "safe-buffer": "~5.1.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+          "dev": true
+        }
       }
     },
     "stringify-object": {
@@ -14838,6 +14954,16 @@
         "stable": "^0.1.8",
         "unquote": "~1.1.1",
         "util.promisify": "~1.0.0"
+      },
+      "dependencies": {
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        }
       }
     },
     "symbol-tree": {
@@ -14865,14 +14991,16 @@
       "dev": true
     },
     "tar": {
-      "version": "2.2.2",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.2.tgz",
-      "integrity": "sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==",
-      "dev": true,
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-6.0.2.tgz",
+      "integrity": "sha512-Glo3jkRtPcvpDlAs/0+hozav78yoXKFr+c4wgw62NNMO3oo4AaJdCo21Uu7lcwr55h39W2XD1LMERc64wtbItg==",
       "requires": {
-        "block-stream": "*",
-        "fstream": "^1.0.12",
-        "inherits": "2"
+        "chownr": "^2.0.0",
+        "fs-minipass": "^2.0.0",
+        "minipass": "^3.0.0",
+        "minizlib": "^2.1.0",
+        "mkdirp": "^1.0.3",
+        "yallist": "^4.0.0"
       }
     },
     "terminal-link": {
@@ -14995,6 +15123,25 @@
             "yallist": "^3.0.2"
           }
         },
+        "make-dir": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/make-dir/-/make-dir-2.1.0.tgz",
+          "integrity": "sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==",
+          "dev": true,
+          "requires": {
+            "pify": "^4.0.1",
+            "semver": "^5.6.0"
+          }
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        },
         "p-limit": {
           "version": "2.3.0",
           "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
@@ -15048,6 +15195,12 @@
             "ajv-keywords": "^3.1.0"
           }
         },
+        "semver": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+          "dev": true
+        },
         "serialize-javascript": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-3.1.0.tgz",
@@ -15533,9 +15686,9 @@
       }
     },
     "uuid": {
-      "version": "8.2.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.2.0.tgz",
-      "integrity": "sha512-CYpGiFTUrmI6OBMkAdjSDM0k5h8SkkiTP4WAjQgDgNB1S3Ou9VBEvr6q0Kv2H1mMk7IWfxYGpMH5sd5AvcIV2Q==",
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-8.3.0.tgz",
+      "integrity": "sha512-fX6Z5o4m6XsXBdli9g7DtWgAx+osMsRRZFKma1mIUsLCz6vRvv+pz5VNbyu9UEDzpMWulZfvpgb/cmDXVulYFQ==",
       "dev": true,
       "optional": true
     },
@@ -15763,9 +15916,9 @@
       "dev": true
     },
     "webpack": {
-      "version": "4.44.0",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.44.0.tgz",
-      "integrity": "sha512-wAuJxK123sqAw31SpkPiPW3iKHgFUiKvO7E7UZjtdExcsRe3fgav4mvoMM7vvpjLHVoJ6a0Mtp2fzkoA13e0Zw==",
+      "version": "4.44.1",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.44.1.tgz",
+      "integrity": "sha512-4UOGAohv/VGUNQJstzEywwNxqX417FnjZgZJpJQegddzPmTvph37eBIRbRTfdySXzVtJXLJfbMN3mMYhM6GdmQ==",
       "dev": true,
       "requires": {
         "@webassemblyjs/ast": "1.9.0",
@@ -15809,6 +15962,15 @@
             "estraverse": "^4.1.1"
           }
         },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        },
         "schema-utils": {
           "version": "1.0.0",
           "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
@@ -15875,9 +16037,9 @@
       }
     },
     "which": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
-      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
         "isexe": "^2.0.0"
@@ -16040,6 +16202,17 @@
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
+      },
+      "dependencies": {
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        }
       }
     },
     "write-file-atomic": {
@@ -16091,10 +16264,9 @@
       "dev": true
     },
     "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     },
     "yaml": {
       "version": "1.10.0",
diff --git a/package.json b/package.json
index 3b1ac92..0e2e0dc 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "cacache": "^15.0.5",
     "cssnano": "^4.1.10",
     "find-cache-dir": "^3.3.1",
-    "jest-worker": "^26.1.0",
+    "jest-worker": "^26.2.0",
     "p-limit": "^3.0.2",
     "schema-utils": "^2.7.0",
     "serialize-javascript": "^4.0.0",
@@ -59,8 +59,9 @@
     "@commitlint/config-conventional": "^9.1.1",
     "@webpack-contrib/defaults": "^6.3.0",
     "@webpack-contrib/eslint-config-webpack": "^3.0.0",
-    "babel-jest": "^26.1.0",
+    "babel-jest": "^26.2.0",
     "commitlint-azure-pipelines-cli": "^1.0.3",
+    "copy-webpack-plugin": "^6.0.3",
     "cross-env": "^7.0.2",
     "css-loader": "^3.6.0",
     "del": "^5.1.0",
@@ -69,17 +70,18 @@
     "eslint-config-prettier": "^6.11.0",
     "eslint-plugin-import": "^2.22.0",
     "husky": "^4.2.5",
-    "jest": "^26.1.0",
+    "jest": "^26.2.0",
     "jest-junit": "^11.0.1",
     "lint-staged": "^10.2.11",
     "memfs": "^3.2.0",
     "mini-css-extract-plugin": "^0.9.0",
     "node-sass": "^4.14.1",
     "npm-run-all": "^4.1.5",
+    "postcss": "^7.0.32",
     "prettier": "^2.0.5",
     "sass-loader": "^9.0.2",
     "standard-version": "^8.0.2",
-    "webpack": "^4.44.0"
+    "webpack": "^4.44.1"
   },
   "keywords": [
     "cssnano",
diff --git a/src/index.js b/src/index.js
index 139cf21..928df40 100644
--- a/src/index.js
+++ b/src/index.js
@@ -41,6 +41,7 @@ class CssnanoPlugin {
       parallel = true,
       include,
       exclude,
+      minify,
     } = options;
 
     this.options = {
@@ -53,6 +54,7 @@ class CssnanoPlugin {
       parallel,
       include,
       exclude,
+      minify,
     };
 
     if (this.options.sourceMap === true) {
@@ -86,7 +88,7 @@ class CssnanoPlugin {
         sourceMap &&
         sourceMap.originalPositionFor({
           line: error.line,
-          column: error.col,
+          column: error.column,
         });
 
       if (original && original.source && requestShortener) {
@@ -95,7 +97,7 @@ class CssnanoPlugin {
             error.message
           } [${requestShortener.shorten(original.source)}:${original.line},${
             original.column
-          }][${file}:${error.line},${error.col}]${
+          }][${file}:${error.line},${error.column}]${
             error.stack
               ? `\n${error.stack.split('\n').slice(1).join('\n')}`
               : ''
@@ -106,7 +108,7 @@ class CssnanoPlugin {
       return new Error(
         `${file} from Cssnano Webpack Plugin\n${error.message} [${file}:${
           error.line
-        },${error.col}]${
+        },${error.column}]${
           error.stack ? `\n${error.stack.split('\n').slice(1).join('\n')}` : ''
         }`
       );
@@ -273,19 +275,13 @@ class CssnanoPlugin {
 
     const postcssOptions = { to: file, from: file, map: false };
 
-    if (inputSourceMap) {
-      postcssOptions.map = Object.assign(
-        { prev: inputSourceMap },
-        this.options.sourceMap
-      );
-    }
-
     const task = {
-      file,
       input,
       inputSourceMap,
       postcssOptions,
+      map: this.options.sourceMap,
       cssnanoOptions: this.options.cssnanoOptions,
+      minify: this.options.minify,
       callback,
     };
 
@@ -377,7 +373,7 @@ class CssnanoPlugin {
           if (worker) {
             taskResult = await worker.transform(serialize(task));
           } else {
-            taskResult = minifyFn(task);
+            taskResult = await minifyFn(task);
           }
         } catch (error) {
           taskResult = { error };
@@ -452,23 +448,9 @@ class CssnanoPlugin {
     );
 
     const optimizeFn = async (compilation, chunksOrAssets) => {
-      let assetNames;
-
-      if (CssnanoPlugin.isWebpack4()) {
-        assetNames = []
-          .concat(Array.from(compilation.additionalChunkAssets || []))
-          .concat(
-            Array.from(chunksOrAssets).reduce(
-              (acc, chunk) => acc.concat(Array.from(chunk.files || [])),
-              []
-            )
-          )
-          .filter((file) => matchObject(file));
-      } else {
-        assetNames = []
-          .concat(Object.keys(chunksOrAssets))
-          .filter((file) => matchObject(file));
-      }
+      const assetNames = Object.keys(
+        CssnanoPlugin.isWebpack4() ? compilation.assets : chunksOrAssets
+      ).filter((file) => matchObject(file));
 
       if (assetNames.length === 0) {
         return Promise.resolve();
@@ -545,4 +527,4 @@ class CssnanoPlugin {
   }
 }
 
-module.exports = CssnanoPlugin;
+export default CssnanoPlugin;
diff --git a/src/minify.js b/src/minify.js
index c09f6a0..9cafb58 100644
--- a/src/minify.js
+++ b/src/minify.js
@@ -1,12 +1,34 @@
 const cssnano = require('cssnano');
 
-const minify = (options) => {
-  const { input, postcssOptions, cssnanoOptions } = options;
+const minify = async (options) => {
+  const {
+    input,
+    postcssOptions,
+    cssnanoOptions,
+    map,
+    inputSourceMap,
+    minify: minifyFn,
+  } = options;
 
-  return cssnano.process(input, postcssOptions, cssnanoOptions);
+  if (minifyFn) {
+    return minifyFn({ input, postcssOptions, cssnanoOptions }, inputSourceMap);
+  }
+
+  if (inputSourceMap) {
+    postcssOptions.map = { prev: inputSourceMap, ...map };
+  }
+
+  const result = await cssnano.process(input, postcssOptions, cssnanoOptions);
+
+  return {
+    css: result.css,
+    map: result.map,
+    error: result.error,
+    warnings: result.warnings(),
+  };
 };
 
-function transform(options) {
+async function transform(options) {
   // 'use strict' => this === undefined (Clean Scope)
   // Safer for possible security issues, albeit not critical at all here
   // eslint-disable-next-line no-new-func, no-param-reassign
@@ -19,13 +41,9 @@ function transform(options) {
     `'use strict'\nreturn ${options}`
   )(exports, require, module, __filename, __dirname);
 
-  const result = minify(options);
+  const result = await minify(options);
 
-  if (result.error) {
-    throw result.error;
-  } else {
-    return result;
-  }
+  return result;
 }
 
 module.exports.minify = minify;
diff --git a/src/options.json b/src/options.json
index d55c583..7216f60 100644
--- a/src/options.json
+++ b/src/options.json
@@ -107,6 +107,10 @@
     "warningsFilter": {
       "description": "Allow to filter `cssnano` warnings.",
       "instanceof": "Function"
+    },
+    "minify": {
+      "description": "Allows you to override default minify function.",
+      "instanceof": "Function"
     }
   },
   "additionalProperties": false
diff --git a/test/CssNano.test.js b/test/CssNano.test.js
deleted file mode 100644
index 014fea5..0000000
--- a/test/CssNano.test.js
+++ /dev/null
@@ -1,55 +0,0 @@
-import MiniCssExtractPlugin from 'mini-css-extract-plugin';
-
-import CssnanoPlugin from '../src/index';
-
-import { createCompiler, compile } from './compiler';
-
-import { readAsset, normalizedSourceMap, removeCache } from './helpers';
-
-describe('CssnanoPlugin', () => {
-  jest.setTimeout(30000);
-
-  beforeEach(() => Promise.all([removeCache()]));
-
-  afterEach(() => Promise.all([removeCache()]));
-
-  it('should work with assets using querystring', () => {
-    const config = {
-      devtool: 'source-map',
-      entry: {
-        entry: `${__dirname}/fixtures/foo.css`,
-      },
-      plugins: [
-        new MiniCssExtractPlugin({
-          filename: '[name].css?v=test',
-          chunkFilename: '[id].[name].css?v=test',
-        }),
-      ],
-    };
-
-    const compiler = createCompiler(config);
-    new CssnanoPlugin({
-      sourceMap: true,
-    }).apply(compiler);
-
-    return compile(compiler).then((stats) => {
-      expect(stats.compilation.errors).toEqual([]);
-      expect(stats.compilation.warnings).toEqual([]);
-
-      // eslint-disable-next-line guard-for-in
-      for (const file in stats.compilation.assets) {
-        // eslint-disable-next-line no-continue
-
-        if (/\.css\?/.test(file)) {
-          expect(readAsset(file, compiler, stats)).toMatchSnapshot(file);
-        }
-
-        // eslint-disable-next-line no-continue
-        if (!/\.css.map/.test(file)) continue;
-        expect(
-          normalizedSourceMap(readAsset(file, compiler, stats))
-        ).toMatchSnapshot(file);
-      }
-    });
-  });
-});
diff --git a/test/CssnanoPlugin.test.js b/test/CssnanoPlugin.test.js
new file mode 100644
index 0000000..5891394
--- /dev/null
+++ b/test/CssnanoPlugin.test.js
@@ -0,0 +1,344 @@
+import path from 'path';
+
+import postcss from 'postcss';
+import MiniCssExtractPlugin from 'mini-css-extract-plugin';
+import CopyPlugin from 'copy-webpack-plugin';
+import RequestShortener from 'webpack/lib/RequestShortener';
+
+import CssnanoPlugin from '../src/index';
+
+import {
+  getCompiler,
+  getErrors,
+  getWarnings,
+  compile,
+  readAssets,
+  readAsset,
+  removeCache,
+  normalizedSourceMap,
+} from './helpers';
+
+jest.setTimeout(30000);
+
+describe('CssnanoPlugin', () => {
+  const rawSourceMap = {
+    version: 3,
+    file: 'test.css',
+    names: ['bar', 'baz', 'n'],
+    sources: ['one.css', 'two.css'],
+    sourceRoot: 'http://example.com/www/js/',
+    mappings:
+      'CAAC,IAAI,IAAM,SAAUA,GAClB,OAAOC,IAAID;CCDb,IAAI,IAAM,SAAUE,GAClB,OAAOA',
+  };
+
+  const emptyRawSourceMap = {
+    version: 3,
+    sources: [],
+    mappings: '',
+  };
+
+  beforeEach(() => Promise.all([removeCache()]));
+
+  afterEach(() => Promise.all([removeCache()]));
+
+  it('should respect the hash options #1', () => {
+    const compiler = getCompiler({
+      output: {
+        pathinfo: false,
+        path: path.resolve(__dirname, 'dist'),
+        filename: '[name].js',
+        chunkFilename: '[id].[name].js',
+        hashDigest: 'hex',
+        hashDigestLength: 20,
+        hashFunction: 'sha256',
+        hashSalt: 'salt',
+      },
+      entry: {
+        entry: `${__dirname}/fixtures/test/foo.css`,
+      },
+    });
+    new CssnanoPlugin({
+      cssnanoOptions: {
+        preset: ['default', { discardEmpty: false }],
+      },
+    }).apply(compiler);
+
+    return compile(compiler).then((stats) => {
+      expect(stats.compilation.errors).toEqual([]);
+      expect(stats.compilation.warnings).toEqual([]);
+
+      for (const file in stats.compilation.assets) {
+        // eslint-disable-next-line no-continue
+        if (/\.js$/.test(file)) continue;
+        expect(readAsset(file, compiler, stats)).toMatchSnapshot(file);
+      }
+    });
+  });
+
+  it('should write stdout and stderr of workers to stdout and stderr of main process in parallel mode', async () => {
+    const { write: stdoutWrite } = process.stdout;
+    const { write: stderrWrite } = process.stderr;
+
+    let stdoutOutput = '';
+    let stderrOutput = '';
+
+    process.stdout.write = (str) => {
+      stdoutOutput += str;
+    };
+
+    process.stderr.write = (str) => {
+      stderrOutput += str;
+    };
+
+    const compiler = getCompiler({
+      entry: {
+        one: `${__dirname}/fixtures/entry.js`,
+        two: `${__dirname}/fixtures/entry.js`,
+      },
+    });
+
+    new CssnanoPlugin({
+      parallel: true,
+      minify: () => {
+        // eslint-disable-next-line no-console
+        process.stdout.write('stdout\n');
+        // eslint-disable-next-line no-console
+        process.stderr.write('stderr\n');
+
+        return { css: '.minify {};' };
+      },
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(stdoutOutput).toMatchSnapshot('process stdout output');
+    expect(stderrOutput).toMatchSnapshot('process stderr output');
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+    process.stdout.write = stdoutWrite;
+    process.stderr.write = stderrWrite;
+  });
+
+  it('isSourceMap method', () => {
+    expect(CssnanoPlugin.isSourceMap(null)).toBe(false);
+    expect(CssnanoPlugin.isSourceMap()).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({})).toBe(false);
+    expect(CssnanoPlugin.isSourceMap([])).toBe(false);
+    expect(CssnanoPlugin.isSourceMap('foo')).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({ version: 3 })).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({ sources: '' })).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({ mappings: [] })).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({ version: 3, sources: '' })).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({ version: 3, mappings: [] })).toBe(false);
+    expect(CssnanoPlugin.isSourceMap({ sources: '', mappings: [] })).toBe(
+      false
+    );
+    expect(
+      CssnanoPlugin.isSourceMap({ version: 3, sources: '', mappings: [] })
+    ).toBe(false);
+    expect(CssnanoPlugin.isSourceMap(rawSourceMap)).toBe(true);
+    expect(CssnanoPlugin.isSourceMap(emptyRawSourceMap)).toBe(true);
+  });
+
+  it('buildSourceMap method', () => {
+    expect(CssnanoPlugin.buildSourceMap()).toBe(null);
+    expect(CssnanoPlugin.buildSourceMap('invalid')).toBe(null);
+    expect(CssnanoPlugin.buildSourceMap({})).toBe(null);
+    expect(CssnanoPlugin.buildSourceMap(rawSourceMap)).toMatchSnapshot();
+  });
+
+  it('buildError method', () => {
+    const error = new Error('Message');
+
+    error.stack = null;
+
+    expect(CssnanoPlugin.buildError(error, 'test.css')).toMatchSnapshot();
+
+    const errorWithLineAndCol = new Error('Message');
+
+    errorWithLineAndCol.stack = null;
+    errorWithLineAndCol.line = 1;
+    errorWithLineAndCol.column = 1;
+
+    expect(
+      CssnanoPlugin.buildError(
+        errorWithLineAndCol,
+        'test.css',
+        CssnanoPlugin.buildSourceMap(rawSourceMap)
+      )
+    ).toMatchSnapshot();
+
+    const otherErrorWithLineAndCol = new Error('Message');
+
+    otherErrorWithLineAndCol.stack = null;
+    otherErrorWithLineAndCol.line = 1;
+    otherErrorWithLineAndCol.column = 1;
+
+    expect(
+      CssnanoPlugin.buildError(
+        otherErrorWithLineAndCol,
+        'test.css',
+        CssnanoPlugin.buildSourceMap(rawSourceMap),
+        new RequestShortener('/example.com/www/js/')
+      )
+    ).toMatchSnapshot();
+
+    const errorWithStack = new Error('Message');
+
+    errorWithStack.stack = 'Stack';
+
+    expect(
+      CssnanoPlugin.buildError(errorWithStack, 'test.css')
+    ).toMatchSnapshot();
+  });
+
+  it('buildWarning method', () => {
+    expect(
+      CssnanoPlugin.buildWarning('Warning [test.css:1,1]')
+    ).toMatchSnapshot();
+    expect(
+      CssnanoPlugin.buildWarning('Warning [test.css:1,1]', 'test.css')
+    ).toMatchSnapshot();
+    expect(
+      CssnanoPlugin.buildWarning(
+        'Warning [test.css:1,1]',
+        'test.css',
+        CssnanoPlugin.buildSourceMap(rawSourceMap)
+      )
+    ).toMatchSnapshot();
+    expect(
+      CssnanoPlugin.buildWarning(
+        'Warning [test.css:1,1]',
+        'test.css',
+        CssnanoPlugin.buildSourceMap(rawSourceMap),
+        new RequestShortener('/example.com/www/js/')
+      )
+    ).toMatchSnapshot();
+    expect(
+      CssnanoPlugin.buildWarning(
+        'Warning [test.css:1,1]',
+        'test.css',
+        CssnanoPlugin.buildSourceMap(rawSourceMap),
+        new RequestShortener('/example.com/www/js/'),
+        () => true
+      )
+    ).toMatchSnapshot();
+    expect(
+      CssnanoPlugin.buildWarning(
+        'Warning [test.css:1,1]',
+        'test.css',
+        CssnanoPlugin.buildSourceMap(rawSourceMap),
+        new RequestShortener('/example.com/www/js/'),
+        () => false
+      )
+    ).toMatchSnapshot();
+  });
+
+  it('should build error', () => {
+    const compiler = getCompiler({
+      entry: {
+        foo: `${__dirname}/fixtures/test/foo.css`,
+      },
+      plugins: [
+        new CopyPlugin({
+          patterns: [
+            {
+              context: `${__dirname}/fixtures/test`,
+              from: `error.css`,
+            },
+          ],
+        }),
+        new MiniCssExtractPlugin({
+          filename: '[name].css',
+          chunkFilename: '[id].[name].css',
+        }),
+      ],
+    });
+
+    new CssnanoPlugin().apply(compiler);
+
+    return compile(compiler).then((stats) => {
+      expect(getErrors(stats)).toMatchSnapshot('error');
+      expect(getWarnings(stats)).toMatchSnapshot('warning');
+    });
+  });
+
+  it('should build warning', () => {
+    const compiler = getCompiler({
+      entry: {
+        foo: `${__dirname}/fixtures/test/foo.css`,
+      },
+    });
+
+    const plugin = postcss.plugin('warning-plugin', () => (css, result) => {
+      result.warn('Warning', {
+        word: 'warning_word',
+        index: 2,
+        plugin: 'warning-plugin',
+      });
+    });
+
+    new CssnanoPlugin({
+      parallel: false,
+      minify: (data) => {
+        return postcss([plugin])
+          .process(data.input, data.postcssOptions)
+          .then((result) => {
+            return {
+              css: result.css,
+              map: result.map,
+              error: result.error,
+              warnings: result.warnings(),
+            };
+          });
+      },
+    }).apply(compiler);
+
+    return compile(compiler).then((stats) => {
+      expect(getErrors(stats)).toMatchSnapshot('error');
+      expect(getWarnings(stats)).toMatchSnapshot('warning');
+    });
+  });
+
+  it('should work with assets using querystring', () => {
+    const config = {
+      devtool: 'source-map',
+      entry: {
+        entry: `${__dirname}/fixtures/foo.css`,
+      },
+      plugins: [
+        new MiniCssExtractPlugin({
+          filename: '[name].css?v=test',
+          chunkFilename: '[id].[name].css?v=test',
+        }),
+      ],
+    };
+
+    const compiler = getCompiler(config);
+    new CssnanoPlugin({
+      sourceMap: true,
+    }).apply(compiler);
+
+    return compile(compiler).then((stats) => {
+      expect(stats.compilation.errors).toEqual([]);
+      expect(stats.compilation.warnings).toEqual([]);
+
+      // eslint-disable-next-line guard-for-in
+      for (const file in stats.compilation.assets) {
+        // eslint-disable-next-line no-continue
+
+        if (/\.css\?/.test(file)) {
+          expect(readAsset(file, compiler, stats)).toMatchSnapshot(file);
+        }
+
+        // eslint-disable-next-line no-continue
+        if (!/\.css.map/.test(file)) continue;
+        expect(
+          normalizedSourceMap(readAsset(file, compiler, stats))
+        ).toMatchSnapshot(file);
+      }
+    });
+  });
+});
diff --git a/test/__snapshots__/CssNano.test.js.snap b/test/__snapshots__/CssNano.test.js.snap.webpack4
similarity index 100%
rename from test/__snapshots__/CssNano.test.js.snap
rename to test/__snapshots__/CssNano.test.js.snap.webpack4
diff --git a/test/__snapshots__/CssnanoPlugin.test.js.snap.webpack4 b/test/__snapshots__/CssnanoPlugin.test.js.snap.webpack4
new file mode 100644
index 0000000..516b3c8
--- /dev/null
+++ b/test/__snapshots__/CssnanoPlugin.test.js.snap.webpack4
@@ -0,0 +1,118 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CssnanoPlugin buildError method 1`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Message]
+`;
+
+exports[`CssnanoPlugin buildError method 2`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Message [test.css:1,1]]
+`;
+
+exports[`CssnanoPlugin buildError method 3`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Message [http://example.com/www/js/one.css:1,1][test.css:1,1]]
+`;
+
+exports[`CssnanoPlugin buildError method 4`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Stack]
+`;
+
+exports[`CssnanoPlugin buildSourceMap method 1`] = `
+SourceMapConsumer {
+  "_absoluteSources": Array [
+    "http://example.com/www/js/one.css",
+    "http://example.com/www/js/two.css",
+  ],
+  "_mappings": "CAAC,IAAI,IAAM,SAAUA,GAClB,OAAOC,IAAID;CCDb,IAAI,IAAM,SAAUE,GAClB,OAAOA",
+  "_names": ArraySet {
+    "_array": Array [
+      "bar",
+      "baz",
+      "n",
+    ],
+    "_set": Map {
+      "bar" => 0,
+      "baz" => 1,
+      "n" => 2,
+    },
+  },
+  "_sourceMapURL": undefined,
+  "_sources": ArraySet {
+    "_array": Array [
+      "one.css",
+      "two.css",
+    ],
+    "_set": Map {
+      "one.css" => 0,
+      "two.css" => 1,
+    },
+  },
+  "file": "test.css",
+  "sourceRoot": "http://example.com/www/js/",
+  "sourcesContent": null,
+}
+`;
+
+exports[`CssnanoPlugin buildWarning method 1`] = `"Cssnano Webpack Plugin: Warning [test.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 2`] = `"Cssnano Webpack Plugin: Warning [test.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 3`] = `"Cssnano Webpack Plugin: Warning [test.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 4`] = `"Cssnano Webpack Plugin: Warning [http://example.com/www/js/one.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 5`] = `"Cssnano Webpack Plugin: Warning [http://example.com/www/js/one.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 6`] = `null`;
+
+exports[`CssnanoPlugin should build error: error 1`] = `
+Array [
+  "Error: error.css from Cssnano Webpack Plugin
+/error.css:1:1: Unknown word [error.css:1,1]",
+]
+`;
+
+exports[`CssnanoPlugin should build error: warning 1`] = `Array []`;
+
+exports[`CssnanoPlugin should build warning: error 1`] = `Array []`;
+
+exports[`CssnanoPlugin should build warning: warning 1`] = `
+Array [
+  "Cssnano Webpack Plugin: warning-plugin: Warning",
+]
+`;
+
+exports[`CssnanoPlugin should respect the hash options #1: entry.css 1`] = `"a{text-align:center}"`;
+
+exports[`CssnanoPlugin should work with assets using querystring: entry.css.map?v=test 1`] = `"{\\"version\\":3,\\"sources\\": [replaced for tests], \\"names\\":[],\\"mappings\\":\\"AAAA,KACA,SACA,CACA,EACA,UACA\\",\\"file\\":\\"entry.css?v=test\\",\\"sourcesContent\\":[\\"body {\\\\n  color: red;\\\\n}\\\\na {\\\\n  color: blue;\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`CssnanoPlugin should work with assets using querystring: entry.css?v=test 1`] = `
+"body{color:red}a{color:#00f}
+/*# sourceMappingURL=entry.css.map?v=test*/"
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: assets 1`] = `
+Object {
+  "one.css": ".minify {};",
+  "two.css": ".minify {};",
+}
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: errors 1`] = `Array []`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: process stderr output 1`] = `
+"stderr
+stderr
+"
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: process stdout output 1`] = `
+"stdout
+stdout
+"
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/CssnanoPlugin.test.js.snap.webpack5 b/test/__snapshots__/CssnanoPlugin.test.js.snap.webpack5
new file mode 100644
index 0000000..516b3c8
--- /dev/null
+++ b/test/__snapshots__/CssnanoPlugin.test.js.snap.webpack5
@@ -0,0 +1,118 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CssnanoPlugin buildError method 1`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Message]
+`;
+
+exports[`CssnanoPlugin buildError method 2`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Message [test.css:1,1]]
+`;
+
+exports[`CssnanoPlugin buildError method 3`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Message [http://example.com/www/js/one.css:1,1][test.css:1,1]]
+`;
+
+exports[`CssnanoPlugin buildError method 4`] = `
+[Error: test.css from Cssnano Webpack Plugin
+Stack]
+`;
+
+exports[`CssnanoPlugin buildSourceMap method 1`] = `
+SourceMapConsumer {
+  "_absoluteSources": Array [
+    "http://example.com/www/js/one.css",
+    "http://example.com/www/js/two.css",
+  ],
+  "_mappings": "CAAC,IAAI,IAAM,SAAUA,GAClB,OAAOC,IAAID;CCDb,IAAI,IAAM,SAAUE,GAClB,OAAOA",
+  "_names": ArraySet {
+    "_array": Array [
+      "bar",
+      "baz",
+      "n",
+    ],
+    "_set": Map {
+      "bar" => 0,
+      "baz" => 1,
+      "n" => 2,
+    },
+  },
+  "_sourceMapURL": undefined,
+  "_sources": ArraySet {
+    "_array": Array [
+      "one.css",
+      "two.css",
+    ],
+    "_set": Map {
+      "one.css" => 0,
+      "two.css" => 1,
+    },
+  },
+  "file": "test.css",
+  "sourceRoot": "http://example.com/www/js/",
+  "sourcesContent": null,
+}
+`;
+
+exports[`CssnanoPlugin buildWarning method 1`] = `"Cssnano Webpack Plugin: Warning [test.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 2`] = `"Cssnano Webpack Plugin: Warning [test.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 3`] = `"Cssnano Webpack Plugin: Warning [test.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 4`] = `"Cssnano Webpack Plugin: Warning [http://example.com/www/js/one.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 5`] = `"Cssnano Webpack Plugin: Warning [http://example.com/www/js/one.css:1,1]"`;
+
+exports[`CssnanoPlugin buildWarning method 6`] = `null`;
+
+exports[`CssnanoPlugin should build error: error 1`] = `
+Array [
+  "Error: error.css from Cssnano Webpack Plugin
+/error.css:1:1: Unknown word [error.css:1,1]",
+]
+`;
+
+exports[`CssnanoPlugin should build error: warning 1`] = `Array []`;
+
+exports[`CssnanoPlugin should build warning: error 1`] = `Array []`;
+
+exports[`CssnanoPlugin should build warning: warning 1`] = `
+Array [
+  "Cssnano Webpack Plugin: warning-plugin: Warning",
+]
+`;
+
+exports[`CssnanoPlugin should respect the hash options #1: entry.css 1`] = `"a{text-align:center}"`;
+
+exports[`CssnanoPlugin should work with assets using querystring: entry.css.map?v=test 1`] = `"{\\"version\\":3,\\"sources\\": [replaced for tests], \\"names\\":[],\\"mappings\\":\\"AAAA,KACA,SACA,CACA,EACA,UACA\\",\\"file\\":\\"entry.css?v=test\\",\\"sourcesContent\\":[\\"body {\\\\n  color: red;\\\\n}\\\\na {\\\\n  color: blue;\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`CssnanoPlugin should work with assets using querystring: entry.css?v=test 1`] = `
+"body{color:red}a{color:#00f}
+/*# sourceMappingURL=entry.css.map?v=test*/"
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: assets 1`] = `
+Object {
+  "one.css": ".minify {};",
+  "two.css": ".minify {};",
+}
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: errors 1`] = `Array []`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: process stderr output 1`] = `
+"stderr
+stderr
+"
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: process stdout output 1`] = `
+"stdout
+stdout
+"
+`;
+
+exports[`CssnanoPlugin should write stdout and stderr of workers to stdout and stderr of main process in parallel mode: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/cache-option.test.js.snap.webpack4 b/test/__snapshots__/cache-option.test.js.snap.webpack4
new file mode 100644
index 0000000..ce5ae8c
--- /dev/null
+++ b/test/__snapshots__/cache-option.test.js.snap.webpack4
@@ -0,0 +1,155 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`cache option should match snapshot and invalid cache when entry point was renamed: assets 1`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot and invalid cache when entry point was renamed: assets 2`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "onne.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot and invalid cache when entry point was renamed: errors 1`] = `Array []`;
+
+exports[`cache option should match snapshot and invalid cache when entry point was renamed: errors 2`] = `Array []`;
+
+exports[`cache option should match snapshot and invalid cache when entry point was renamed: warnings 1`] = `Array []`;
+
+exports[`cache option should match snapshot and invalid cache when entry point was renamed: warnings 2`] = `Array []`;
+
+exports[`cache option should match snapshot for the "false" value: assets 1`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot for the "false" value: errors 1`] = `Array []`;
+
+exports[`cache option should match snapshot for the "false" value: warnings 1`] = `Array []`;
+
+exports[`cache option should match snapshot for the "other-cache-directory" value: assets 1`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot for the "other-cache-directory" value: assets 2`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot for the "other-cache-directory" value: errors 1`] = `Array []`;
+
+exports[`cache option should match snapshot for the "other-cache-directory" value: errors 2`] = `Array []`;
+
+exports[`cache option should match snapshot for the "other-cache-directory" value: warnings 1`] = `Array []`;
+
+exports[`cache option should match snapshot for the "other-cache-directory" value: warnings 2`] = `Array []`;
+
+exports[`cache option should match snapshot for the "true" value: assets 1`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot for the "true" value: assets 2`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot for the "true" value: errors 1`] = `Array []`;
+
+exports[`cache option should match snapshot for the "true" value: errors 2`] = `Array []`;
+
+exports[`cache option should match snapshot for the "true" value: warnings 1`] = `Array []`;
+
+exports[`cache option should match snapshot for the "true" value: warnings 2`] = `Array []`;
+
+exports[`cache option should match snapshot when "cacheKey" is custom "function": assets 1`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot when "cacheKey" is custom "function": assets 2`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot when "cacheKey" is custom "function": errors 1`] = `Array []`;
+
+exports[`cache option should match snapshot when "cacheKey" is custom "function": errors 2`] = `Array []`;
+
+exports[`cache option should match snapshot when "cacheKey" is custom "function": warnings 1`] = `Array []`;
+
+exports[`cache option should match snapshot when "cacheKey" is custom "function": warnings 2`] = `Array []`;
+
+exports[`cache option should match snapshot when a value is not specify: assets 1`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot when a value is not specify: assets 2`] = `
+Object {
+  "five.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "four.css": "h1{color:green}h2{color:#ff0}",
+  "one.css": "a{text-align:center}",
+  "three.css": "body{color:red;font-size:20px}a{color:#00f}",
+  "two.css": "a{text-align:center}",
+}
+`;
+
+exports[`cache option should match snapshot when a value is not specify: errors 1`] = `Array []`;
+
+exports[`cache option should match snapshot when a value is not specify: errors 2`] = `Array []`;
+
+exports[`cache option should match snapshot when a value is not specify: warnings 1`] = `Array []`;
+
+exports[`cache option should match snapshot when a value is not specify: warnings 2`] = `Array []`;
diff --git a/test/__snapshots__/cssnanoOptions-option.test.js.snap b/test/__snapshots__/cssnanoOptions-option.test.js.snap.webpack4
similarity index 100%
rename from test/__snapshots__/cssnanoOptions-option.test.js.snap
rename to test/__snapshots__/cssnanoOptions-option.test.js.snap.webpack4
diff --git a/test/__snapshots__/cssnanoOptions-option.test.js.snap.webpack5 b/test/__snapshots__/cssnanoOptions-option.test.js.snap.webpack5
new file mode 100644
index 0000000..1442488
--- /dev/null
+++ b/test/__snapshots__/cssnanoOptions-option.test.js.snap.webpack5
@@ -0,0 +1,22 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "discardComments" option (disable): entry.css 1`] = `
+"body{
+  /* this is a comment */
+  /*! this is a comment with exclamation mark */color:red}"
+`;
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "discardComments" option (enable [default]): entry.css 1`] = `
+"body{
+  /*! this is a comment with exclamation mark */color:red}"
+`;
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "discardComments" option (enable, with "removeAll" option): entry.css 1`] = `"body{color:red}"`;
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "discardEmpty" option (disable): entry.css 1`] = `"body{color:red}a{}"`;
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "discardEmpty" option (enable [default]): entry.css 1`] = `"body{color:red}"`;
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "mergeRules" option (disable): entry.css 1`] = `"body{color:red}body{font-weight:700}"`;
+
+exports[`when applied with "cssnanoOptions" option matches snapshot for "mergeRules" option (enable [default]): entry.css 1`] = `"body{color:red;font-weight:700}"`;
diff --git a/test/__snapshots__/exclude-option.test.js.snap.webpack4 b/test/__snapshots__/exclude-option.test.js.snap.webpack4
new file mode 100644
index 0000000..1621707
--- /dev/null
+++ b/test/__snapshots__/exclude-option.test.js.snap.webpack4
@@ -0,0 +1,87 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`exclude option should match snapshot for a single RegExp value excluded1: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`exclude option should match snapshot for a single RegExp value excluded1: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for a single RegExp value excluded1: warnings 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for a single String value excluded1: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`exclude option should match snapshot for a single String value excluded1: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for a single String value excluded1: warnings 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple RegExp values excluded1 and excluded2: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`exclude option should match snapshot for multiple RegExp values excluded1 and excluded2: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple RegExp values excluded1 and excluded2: warnings 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple String values excluded1 and excluded2: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`exclude option should match snapshot for multiple String values excluded1 and excluded2: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple String values excluded1 and excluded2: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/exclude-option.test.js.snap.webpack5 b/test/__snapshots__/exclude-option.test.js.snap.webpack5
new file mode 100644
index 0000000..1621707
--- /dev/null
+++ b/test/__snapshots__/exclude-option.test.js.snap.webpack5
@@ -0,0 +1,87 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`exclude option should match snapshot for a single RegExp value excluded1: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`exclude option should match snapshot for a single RegExp value excluded1: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for a single RegExp value excluded1: warnings 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for a single String value excluded1: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`exclude option should match snapshot for a single String value excluded1: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for a single String value excluded1: warnings 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple RegExp values excluded1 and excluded2: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`exclude option should match snapshot for multiple RegExp values excluded1 and excluded2: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple RegExp values excluded1 and excluded2: warnings 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple String values excluded1 and excluded2: assets 1`] = `
+Object {
+  "entry.css": "body{color:red}a{color:#00f}",
+  "excluded1.css": "a {
+  text-align: center;
+}
+
+",
+  "excluded2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`exclude option should match snapshot for multiple String values excluded1 and excluded2: errors 1`] = `Array []`;
+
+exports[`exclude option should match snapshot for multiple String values excluded1 and excluded2: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/include-option.test.js.snap.webpack4 b/test/__snapshots__/include-option.test.js.snap.webpack4
new file mode 100644
index 0000000..268d8b5
--- /dev/null
+++ b/test/__snapshots__/include-option.test.js.snap.webpack4
@@ -0,0 +1,95 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`include option should match snapshot for a single RegExp value included1: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`include option should match snapshot for a single RegExp value included1: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for a single RegExp value included1: warnings 1`] = `Array []`;
+
+exports[`include option should match snapshot for a single String value included1: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`include option should match snapshot for a single String value included1: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for a single String value included1: warnings 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple RegExp values included1 and included2: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`include option should match snapshot for multiple RegExp values included1 and included2: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple RegExp values included1 and included2: warnings 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple String values included1 and included2: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`include option should match snapshot for multiple String values included1 and included2: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple String values included1 and included2: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/include-option.test.js.snap.webpack5 b/test/__snapshots__/include-option.test.js.snap.webpack5
new file mode 100644
index 0000000..268d8b5
--- /dev/null
+++ b/test/__snapshots__/include-option.test.js.snap.webpack5
@@ -0,0 +1,95 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`include option should match snapshot for a single RegExp value included1: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`include option should match snapshot for a single RegExp value included1: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for a single RegExp value included1: warnings 1`] = `Array []`;
+
+exports[`include option should match snapshot for a single String value included1: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+}
+`;
+
+exports[`include option should match snapshot for a single String value included1: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for a single String value included1: warnings 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple RegExp values included1 and included2: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`include option should match snapshot for multiple RegExp values included1 and included2: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple RegExp values included1 and included2: warnings 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple String values included1 and included2: assets 1`] = `
+Object {
+  "entry.css": "body {
+  color: red;
+}
+a {
+  color: blue;
+}
+",
+  "included1.css": "a{text-align:center}",
+  "included2.css": "body{color:red;font-size:20px}a{color:#00f}",
+}
+`;
+
+exports[`include option should match snapshot for multiple String values included1 and included2: errors 1`] = `Array []`;
+
+exports[`include option should match snapshot for multiple String values included1 and included2: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/parallel-option.test.js.snap.webpack4 b/test/__snapshots__/parallel-option.test.js.snap.webpack4
new file mode 100644
index 0000000..2ac1c2b
--- /dev/null
+++ b/test/__snapshots__/parallel-option.test.js.snap.webpack4
@@ -0,0 +1,104 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`parallel option should match snapshot for the "2" value: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "2" value: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "2" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "false" value: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "false" value: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "false" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is less than the number of cores: assets 1`] = `
+Object {
+  "entry-0.css": "body{color:red}a{color:#00f}",
+  "entry-1.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is less than the number of cores: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is less than the number of cores: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is more than the number of cores: assets 1`] = `
+Object {
+  "eight.css": "body{color:red}a{color:#00f}",
+  "five.css": "body{color:red}a{color:#00f}",
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "seven.css": "body{color:red}a{color:#00f}",
+  "six.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is more than the number of cores: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is more than the number of cores: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is same than the number of cores: assets 1`] = `
+Object {
+  "entry-0.css": "body{color:red}a{color:#00f}",
+  "entry-1.css": "body{color:red}a{color:#00f}",
+  "entry-2.css": "body{color:red}a{color:#00f}",
+  "entry-3.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is same than the number of cores: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is same than the number of cores: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value when only one file passed: assets 1`] = `
+Object {
+  "main.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value when only one file passed: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value when only one file passed: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot when a value is not specify: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot when a value is not specify: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot when a value is not specify: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/parallel-option.test.js.snap.webpack5 b/test/__snapshots__/parallel-option.test.js.snap.webpack5
new file mode 100644
index 0000000..2ac1c2b
--- /dev/null
+++ b/test/__snapshots__/parallel-option.test.js.snap.webpack5
@@ -0,0 +1,104 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`parallel option should match snapshot for the "2" value: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "2" value: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "2" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "false" value: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "false" value: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "false" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is less than the number of cores: assets 1`] = `
+Object {
+  "entry-0.css": "body{color:red}a{color:#00f}",
+  "entry-1.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is less than the number of cores: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is less than the number of cores: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is more than the number of cores: assets 1`] = `
+Object {
+  "eight.css": "body{color:red}a{color:#00f}",
+  "five.css": "body{color:red}a{color:#00f}",
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "seven.css": "body{color:red}a{color:#00f}",
+  "six.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is more than the number of cores: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is more than the number of cores: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is same than the number of cores: assets 1`] = `
+Object {
+  "entry-0.css": "body{color:red}a{color:#00f}",
+  "entry-1.css": "body{color:red}a{color:#00f}",
+  "entry-2.css": "body{color:red}a{color:#00f}",
+  "entry-3.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is same than the number of cores: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value and the number of files is same than the number of cores: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value when only one file passed: assets 1`] = `
+Object {
+  "main.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value when only one file passed: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value when only one file passed: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot for the "true" value: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot for the "true" value: warnings 1`] = `Array []`;
+
+exports[`parallel option should match snapshot when a value is not specify: assets 1`] = `
+Object {
+  "four.css": "body{color:red}a{color:#00f}",
+  "one.css": "body{color:red}a{color:#00f}",
+  "three.css": "body{color:red}a{color:#00f}",
+  "two.css": "body{color:red}a{color:#00f}",
+}
+`;
+
+exports[`parallel option should match snapshot when a value is not specify: errors 1`] = `Array []`;
+
+exports[`parallel option should match snapshot when a value is not specify: warnings 1`] = `Array []`;
diff --git a/test/__snapshots__/sourceMap-option.test.js.snap b/test/__snapshots__/sourceMap-option.test.js.snap.webpack4
similarity index 90%
rename from test/__snapshots__/sourceMap-option.test.js.snap
rename to test/__snapshots__/sourceMap-option.test.js.snap.webpack4
index bbd0656..1f94713 100644
--- a/test/__snapshots__/sourceMap-option.test.js.snap
+++ b/test/__snapshots__/sourceMap-option.test.js.snap.webpack4
@@ -49,3 +49,18 @@ exports[`when applied with "sourceMap" option matches snapshot when using Source
 exports[`when applied with "sourceMap" option matches snapshot when using SourceMapDevToolPlugin (with filename, publicPath and fileContext options): sourcemaps/entry.css.map 1`] = `"{\\"version\\":3,\\"sources\\":[\\"webpack:///./test/fixtures/sourcemap/bar.scss\\",\\"webpack:///./test/fixtures/sourcemap/foo.scss\\"],\\"names\\":[],\\"mappings\\":\\"AAAA,KACE,gBCEA,SDFiB,CCCnB,OAGI,iBAAkB\\",\\"file\\":\\"dist/entry.css\\",\\"sourcesContent\\":[\\"body {\\\\n  font-weight: bold;\\\\n}\\",\\"@import 'bar';\\\\n\\\\nbody {\\\\n  color: red;\\\\n  a {\\\\n    text-align: center;\\\\n  }\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
 
 exports[`when applied with "sourceMap" option matches snapshot when using SourceMapDevToolPlugin (with filename, publicPath and fileContext options): sourcemaps/entry2.css.map 1`] = `"{\\"version\\":3,\\"sources\\":[\\"webpack:///./test/fixtures/sourcemap/bar.scss\\",\\"webpack:///./test/fixtures/sourcemap/foo.css\\"],\\"names\\":[],\\"mappings\\":\\"AAAA,KACE,gBCEA,SDFiB,CCGlB,OAGC,iBAAkB\\",\\"file\\":\\"dist/entry2.css\\",\\"sourcesContent\\":[\\"body {\\\\n  font-weight: bold;\\\\n}\\",\\"@import 'bar';\\\\n\\\\nbody {\\\\n  color: red;\\\\n}\\\\n\\\\nbody a {\\\\n  text-align: center;\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option should emit warning when broken sourcemap: error 1`] = `
+Array [
+  "Error: broken-source-map.css from Cssnano Webpack Plugin
+Error: \\"version\\" is a required argument.",
+  "ModuleBuildError: Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
+Error: broken-source-map.css from Cssnano Webpack Plugin",
+]
+`;
+
+exports[`when applied with "sourceMap" option should emit warning when broken sourcemap: warning 1`] = `
+Array [
+  "Error: broken-source-map.css contains invalid source map",
+]
+`;
diff --git a/test/__snapshots__/sourceMap-option.test.js.snap.webpack5 b/test/__snapshots__/sourceMap-option.test.js.snap.webpack5
new file mode 100644
index 0000000..1f94713
--- /dev/null
+++ b/test/__snapshots__/sourceMap-option.test.js.snap.webpack5
@@ -0,0 +1,66 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`when applied with "sourceMap" option matches snapshot for "false" value, using previous sourcemap: entry.css 1`] = `"body{font-weight:700;color:red}body a{text-align:center}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "false" value, using previous sourcemap: entry2.css 1`] = `"body{font-weight:700;color:red}body a{text-align:center}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "false" value, without previous sourcemap: entry.css 1`] = `"body{font-weight:700;color:red}body a{text-align:center}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "false" value, without previous sourcemap: entry2.css 1`] = `"body{font-weight:700;color:red}body a{text-align:center}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, using previous sourcemap: entry.css 1`] = `
+"body{font-weight:700;color:red}body a{text-align:center}
+/*# sourceMappingURL=entry.css.map*/"
+`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, using previous sourcemap: entry.css.map 1`] = `"{\\"version\\":3,\\"sources\\": [replaced for tests], \\"names\\":[],\\"mappings\\":\\"AAAA,KACE,gBCEA,SDFiB,CCCnB,OAGI,iBAAkB\\",\\"file\\":\\"entry.css\\",\\"sourcesContent\\":[\\"body {\\\\n  font-weight: bold;\\\\n}\\",\\"@import 'bar';\\\\n\\\\nbody {\\\\n  color: red;\\\\n  a {\\\\n    text-align: center;\\\\n  }\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, using previous sourcemap: entry2.css 1`] = `
+"body{font-weight:700;color:red}body a{text-align:center}
+/*# sourceMappingURL=entry2.css.map*/"
+`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, using previous sourcemap: entry2.css.map 1`] = `"{\\"version\\":3,\\"sources\\": [replaced for tests], \\"names\\":[],\\"mappings\\":\\"AAAA,KACE,gBCEA,SDFiB,CCGlB,OAGC,iBAAkB\\",\\"file\\":\\"entry2.css\\",\\"sourcesContent\\":[\\"body {\\\\n  font-weight: bold;\\\\n}\\",\\"@import 'bar';\\\\n\\\\nbody {\\\\n  color: red;\\\\n}\\\\n\\\\nbody a {\\\\n  text-align: center;\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, without previous sourcemap: entry.css 1`] = `
+"body{font-weight:700;color:red}body a{text-align:center}
+/*# sourceMappingURL=entry.css.map*/"
+`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, without previous sourcemap: entry.css.map 1`] = `"{\\"version\\":3,\\"sources\\": [replaced for tests], \\"names\\":[],\\"mappings\\":\\"AAAA,KAAK,gBAAsB,SAAtB,CAAgC,OAAO\\",\\"file\\":\\"entry.css\\",\\"sourcesContent\\":[\\"body{font-weight:bold}body{color:red}body a{text-align:center}\\\\n\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, without previous sourcemap: entry2.css 1`] = `
+"body{font-weight:700;color:red}body a{text-align:center}
+/*# sourceMappingURL=entry2.css.map*/"
+`;
+
+exports[`when applied with "sourceMap" option matches snapshot for "true" value, without previous sourcemap: entry2.css.map 1`] = `"{\\"version\\":3,\\"sources\\": [replaced for tests], \\"names\\":[],\\"mappings\\":\\"AAAA,KAAK,gBAAsB,SAAtB,CAAgC,OAAO\\",\\"file\\":\\"entry2.css\\",\\"sourcesContent\\":[\\"body{font-weight:bold}body{color:red}body a{text-align:center}\\\\n\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot when using SourceMapDevToolPlugin (with filename, publicPath and fileContext options): dist/entry.css 1`] = `
+"body{font-weight:700;color:red}body a{text-align:center}
+/*# sourceMappingURL=https://example.com/project/sourcemaps/entry.css.map*/"
+`;
+
+exports[`when applied with "sourceMap" option matches snapshot when using SourceMapDevToolPlugin (with filename, publicPath and fileContext options): dist/entry2.css 1`] = `
+"body{font-weight:700;color:red}body a{text-align:center}
+/*# sourceMappingURL=https://example.com/project/sourcemaps/entry2.css.map*/"
+`;
+
+exports[`when applied with "sourceMap" option matches snapshot when using SourceMapDevToolPlugin (with filename, publicPath and fileContext options): sourcemaps/entry.css.map 1`] = `"{\\"version\\":3,\\"sources\\":[\\"webpack:///./test/fixtures/sourcemap/bar.scss\\",\\"webpack:///./test/fixtures/sourcemap/foo.scss\\"],\\"names\\":[],\\"mappings\\":\\"AAAA,KACE,gBCEA,SDFiB,CCCnB,OAGI,iBAAkB\\",\\"file\\":\\"dist/entry.css\\",\\"sourcesContent\\":[\\"body {\\\\n  font-weight: bold;\\\\n}\\",\\"@import 'bar';\\\\n\\\\nbody {\\\\n  color: red;\\\\n  a {\\\\n    text-align: center;\\\\n  }\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option matches snapshot when using SourceMapDevToolPlugin (with filename, publicPath and fileContext options): sourcemaps/entry2.css.map 1`] = `"{\\"version\\":3,\\"sources\\":[\\"webpack:///./test/fixtures/sourcemap/bar.scss\\",\\"webpack:///./test/fixtures/sourcemap/foo.css\\"],\\"names\\":[],\\"mappings\\":\\"AAAA,KACE,gBCEA,SDFiB,CCGlB,OAGC,iBAAkB\\",\\"file\\":\\"dist/entry2.css\\",\\"sourcesContent\\":[\\"body {\\\\n  font-weight: bold;\\\\n}\\",\\"@import 'bar';\\\\n\\\\nbody {\\\\n  color: red;\\\\n}\\\\n\\\\nbody a {\\\\n  text-align: center;\\\\n}\\"],\\"sourceRoot\\":\\"\\"}"`;
+
+exports[`when applied with "sourceMap" option should emit warning when broken sourcemap: error 1`] = `
+Array [
+  "Error: broken-source-map.css from Cssnano Webpack Plugin
+Error: \\"version\\" is a required argument.",
+  "ModuleBuildError: Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
+Error: broken-source-map.css from Cssnano Webpack Plugin",
+]
+`;
+
+exports[`when applied with "sourceMap" option should emit warning when broken sourcemap: warning 1`] = `
+Array [
+  "Error: broken-source-map.css contains invalid source map",
+]
+`;
diff --git a/test/__snapshots__/test-option.test.js.snap b/test/__snapshots__/test-option.test.js.snap.webpack4
similarity index 100%
rename from test/__snapshots__/test-option.test.js.snap
rename to test/__snapshots__/test-option.test.js.snap.webpack4
diff --git a/test/__snapshots__/test-option.test.js.snap.webpack5 b/test/__snapshots__/test-option.test.js.snap.webpack5
new file mode 100644
index 0000000..6de26e2
--- /dev/null
+++ b/test/__snapshots__/test-option.test.js.snap.webpack5
@@ -0,0 +1,31 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`when applied with "test" option matches snapshot for a single "test" value (RegExp): bar1.css 1`] = `"body{color:red;font-size:20px}a{color:#00f}"`;
+
+exports[`when applied with "test" option matches snapshot for a single "test" value (RegExp): bar2.css 1`] = `"h1{color:green}h2{color:#ff0}"`;
+
+exports[`when applied with "test" option matches snapshot for a single "test" value (RegExp): foo.css 1`] = `
+"a {
+  text-align: center;
+}
+
+"
+`;
+
+exports[`when applied with "test" option matches snapshot for multiple "test" value (RegExp): bar1.css 1`] = `"body{color:red;font-size:20px}a{color:#00f}"`;
+
+exports[`when applied with "test" option matches snapshot for multiple "test" value (RegExp): bar2.css 1`] = `"h1{color:green}h2{color:#ff0}"`;
+
+exports[`when applied with "test" option matches snapshot for multiple "test" value (RegExp): foo.css 1`] = `
+"a {
+  text-align: center;
+}
+
+"
+`;
+
+exports[`when applied with "test" option matches snapshot with empty value: bar1.css 1`] = `"body{color:red;font-size:20px}a{color:#00f}"`;
+
+exports[`when applied with "test" option matches snapshot with empty value: bar2.css 1`] = `"h1{color:green}h2{color:#ff0}"`;
+
+exports[`when applied with "test" option matches snapshot with empty value: foo.css 1`] = `"a{text-align:center}"`;
diff --git a/test/__snapshots__/validate-options.test.js.snap b/test/__snapshots__/validate-options.test.js.snap.webpack4
similarity index 94%
rename from test/__snapshots__/validate-options.test.js.snap
rename to test/__snapshots__/validate-options.test.js.snap.webpack4
index a403fdf..188c90b 100644
--- a/test/__snapshots__/validate-options.test.js.snap
+++ b/test/__snapshots__/validate-options.test.js.snap.webpack4
@@ -146,7 +146,13 @@ exports[`validation 12`] = `
 `;
 
 exports[`validation 13`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.minify should be an instance of function.
+   -> Allows you to override default minify function."
+`;
+
+exports[`validation 14`] = `
 "Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
  - options has an unknown property 'unknown'. These properties are valid:
-   object { test?, include?, exclude?, sourceMap?, cssnanoOptions?, cache?, cacheKeys?, parallel?, warningsFilter? }"
+   object { test?, include?, exclude?, sourceMap?, cssnanoOptions?, cache?, cacheKeys?, parallel?, warningsFilter?, minify? }"
 `;
diff --git a/test/__snapshots__/validate-options.test.js.snap.webpack5 b/test/__snapshots__/validate-options.test.js.snap.webpack5
new file mode 100644
index 0000000..188c90b
--- /dev/null
+++ b/test/__snapshots__/validate-options.test.js.snap.webpack5
@@ -0,0 +1,158 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`validation 1`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.test should be one of these:
+   [RegExp | non-empty string, ...] | RegExp | non-empty string
+   -> Filtering rules.
+   Details:
+    * options.test should be an array:
+      [RegExp | non-empty string, ...]
+    * options.test should be one of these:
+      RegExp | non-empty string
+      -> Filtering rule as regex or string.
+      Details:
+       * options.test should be an instance of RegExp.
+       * options.test should be a non-empty string."
+`;
+
+exports[`validation 2`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.test should be one of these:
+   [RegExp | non-empty string, ...] | RegExp | non-empty string
+   -> Filtering rules.
+   Details:
+    * options.test[0] should be one of these:
+      RegExp | non-empty string
+      -> Filtering rule as regex or string.
+      Details:
+       * options.test[0] should be an instance of RegExp.
+       * options.test[0] should be a non-empty string."
+`;
+
+exports[`validation 3`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.include should be one of these:
+   [RegExp | non-empty string, ...] | RegExp | non-empty string
+   -> Filtering rules.
+   Details:
+    * options.include should be an array:
+      [RegExp | non-empty string, ...]
+    * options.include should be one of these:
+      RegExp | non-empty string
+      -> Filtering rule as regex or string.
+      Details:
+       * options.include should be an instance of RegExp.
+       * options.include should be a non-empty string."
+`;
+
+exports[`validation 4`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.include should be one of these:
+   [RegExp | non-empty string, ...] | RegExp | non-empty string
+   -> Filtering rules.
+   Details:
+    * options.include[0] should be one of these:
+      RegExp | non-empty string
+      -> Filtering rule as regex or string.
+      Details:
+       * options.include[0] should be an instance of RegExp.
+       * options.include[0] should be a non-empty string."
+`;
+
+exports[`validation 5`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.exclude should be one of these:
+   [RegExp | non-empty string, ...] | RegExp | non-empty string
+   -> Filtering rules.
+   Details:
+    * options.exclude should be an array:
+      [RegExp | non-empty string, ...]
+    * options.exclude should be one of these:
+      RegExp | non-empty string
+      -> Filtering rule as regex or string.
+      Details:
+       * options.exclude should be an instance of RegExp.
+       * options.exclude should be a non-empty string."
+`;
+
+exports[`validation 6`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.exclude should be one of these:
+   [RegExp | non-empty string, ...] | RegExp | non-empty string
+   -> Filtering rules.
+   Details:
+    * options.exclude[0] should be one of these:
+      RegExp | non-empty string
+      -> Filtering rule as regex or string.
+      Details:
+       * options.exclude[0] should be an instance of RegExp.
+       * options.exclude[0] should be a non-empty string."
+`;
+
+exports[`validation 7`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.sourceMap should be one of these:
+   object { … } | boolean
+   -> Enables/Disables generation of source maps.
+   Details:
+    * options.sourceMap should be an object:
+      object { … }
+      -> Options for source map.
+    * options.sourceMap should be a boolean."
+`;
+
+exports[`validation 8`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.cssnanoOptions should be an object:
+   object { … }
+   -> Options for \`cssnanoOptions\`."
+`;
+
+exports[`validation 9`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.cache should be one of these:
+   boolean | string
+   -> Enable file caching. Ignored in webpack 5, for webpack 5 please use https://webpack.js.org/configuration/other-options/#cache.
+   Details:
+    * options.cache should be a boolean.
+    * options.cache should be a string."
+`;
+
+exports[`validation 10`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.cacheKeys should be an instance of function.
+   -> Allows you to override default cache keys. Ignored in webpack 5, for webpack 5 please use https://webpack.js.org/configuration/other-options/#cache."
+`;
+
+exports[`validation 11`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.parallel should be one of these:
+   boolean | integer
+   -> Use multi-process parallel running to improve the build speed.
+   Details:
+    * options.parallel should be a boolean.
+    * options.parallel should be a integer."
+`;
+
+exports[`validation 12`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.parallel should be one of these:
+   boolean | integer
+   -> Use multi-process parallel running to improve the build speed.
+   Details:
+    * options.parallel should be a boolean.
+    * options.parallel should be a integer."
+`;
+
+exports[`validation 13`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options.minify should be an instance of function.
+   -> Allows you to override default minify function."
+`;
+
+exports[`validation 14`] = `
+"Invalid options object. Cssnano webpack plugin has been initialized using an options object that does not match the API schema.
+ - options has an unknown property 'unknown'. These properties are valid:
+   object { test?, include?, exclude?, sourceMap?, cssnanoOptions?, cache?, cacheKeys?, parallel?, warningsFilter?, minify? }"
+`;
diff --git a/test/__snapshots__/warningsFilter-option.test.js.snap.webpack4 b/test/__snapshots__/warningsFilter-option.test.js.snap.webpack4
new file mode 100644
index 0000000..e0a2d45
--- /dev/null
+++ b/test/__snapshots__/warningsFilter-option.test.js.snap.webpack4
@@ -0,0 +1,42 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`warningsFilter option should match snapshot for a "function" value: assets 1`] = `
+Object {
+  "bar1.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+  "bar2.css": "h1 {
+  color: green;
+}
+h2 {
+  color: yellow;
+}
+h3 {
+}
+
+",
+  "foo.css": "a {
+  text-align: center;
+}
+
+",
+}
+`;
+
+exports[`warningsFilter option should match snapshot for a "function" value: errors 1`] = `Array []`;
+
+exports[`warningsFilter option should match snapshot for a "function" value: warnings 1`] = `
+Array [
+  "Cssnano Webpack Plugin: warning-plugin: Warning from bar1.css",
+  "Cssnano Webpack Plugin: warning-plugin: Warning from bar2.css",
+]
+`;
diff --git a/test/__snapshots__/warningsFilter-option.test.js.snap.webpack5 b/test/__snapshots__/warningsFilter-option.test.js.snap.webpack5
new file mode 100644
index 0000000..e0a2d45
--- /dev/null
+++ b/test/__snapshots__/warningsFilter-option.test.js.snap.webpack5
@@ -0,0 +1,42 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`warningsFilter option should match snapshot for a "function" value: assets 1`] = `
+Object {
+  "bar1.css": "body {
+  color: red;
+}
+body {
+  color: red;
+  font-size: 20px;
+}
+a {
+  color: blue;
+}
+
+",
+  "bar2.css": "h1 {
+  color: green;
+}
+h2 {
+  color: yellow;
+}
+h3 {
+}
+
+",
+  "foo.css": "a {
+  text-align: center;
+}
+
+",
+}
+`;
+
+exports[`warningsFilter option should match snapshot for a "function" value: errors 1`] = `Array []`;
+
+exports[`warningsFilter option should match snapshot for a "function" value: warnings 1`] = `
+Array [
+  "Cssnano Webpack Plugin: warning-plugin: Warning from bar1.css",
+  "Cssnano Webpack Plugin: warning-plugin: Warning from bar2.css",
+]
+`;
diff --git a/test/__snapshots__/worker.test.js.snap.webpack4 b/test/__snapshots__/worker.test.js.snap.webpack4
new file mode 100644
index 0000000..24006ff
--- /dev/null
+++ b/test/__snapshots__/worker.test.js.snap.webpack4
@@ -0,0 +1,51 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`worker should emit error: error 1`] = `
+Array [
+  "/entry.css:1:1: Unknown word",
+]
+`;
+
+exports[`worker should minify css: css 1`] = `".foo{color:red}.bar{color:coral}"`;
+
+exports[`worker should minify css: map 1`] = `
+Object {
+  "file": "entry.css",
+  "mappings": "AAAA,KAAK,SAAA,CCCL,KAAK,WAAY",
+  "names": Array [],
+  "sources": Array [
+    "foo.css",
+    "entry.css",
+  ],
+  "sourcesContent": Array [
+    ".foo{color:red;}",
+    ".foo{color:red;}
+.bar{color:coral;}",
+  ],
+  "version": 3,
+}
+`;
+
+exports[`worker should work inputSourceMap as prev: css 1`] = `".foo{color:red}.bar{color:coral}"`;
+
+exports[`worker should work inputSourceMap as prev: map 1`] = `
+Object {
+  "file": "entry.css",
+  "mappings": "AAAA,KAAK,SAAA,CCCL,KAAK,WAAY",
+  "names": Array [],
+  "sources": Array [
+    "foo.css",
+    "entry.css",
+  ],
+  "sourcesContent": Array [
+    ".foo{color:red;}",
+    ".foo{color:red;}
+.bar{color:coral;}",
+  ],
+  "version": 3,
+}
+`;
+
+exports[`worker should work options.minify function: css 1`] = `".minify {};"`;
+
+exports[`worker should work options.minify function: map 1`] = `undefined`;
diff --git a/test/__snapshots__/worker.test.js.snap.webpack5 b/test/__snapshots__/worker.test.js.snap.webpack5
new file mode 100644
index 0000000..24006ff
--- /dev/null
+++ b/test/__snapshots__/worker.test.js.snap.webpack5
@@ -0,0 +1,51 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`worker should emit error: error 1`] = `
+Array [
+  "/entry.css:1:1: Unknown word",
+]
+`;
+
+exports[`worker should minify css: css 1`] = `".foo{color:red}.bar{color:coral}"`;
+
+exports[`worker should minify css: map 1`] = `
+Object {
+  "file": "entry.css",
+  "mappings": "AAAA,KAAK,SAAA,CCCL,KAAK,WAAY",
+  "names": Array [],
+  "sources": Array [
+    "foo.css",
+    "entry.css",
+  ],
+  "sourcesContent": Array [
+    ".foo{color:red;}",
+    ".foo{color:red;}
+.bar{color:coral;}",
+  ],
+  "version": 3,
+}
+`;
+
+exports[`worker should work inputSourceMap as prev: css 1`] = `".foo{color:red}.bar{color:coral}"`;
+
+exports[`worker should work inputSourceMap as prev: map 1`] = `
+Object {
+  "file": "entry.css",
+  "mappings": "AAAA,KAAK,SAAA,CCCL,KAAK,WAAY",
+  "names": Array [],
+  "sources": Array [
+    "foo.css",
+    "entry.css",
+  ],
+  "sourcesContent": Array [
+    ".foo{color:red;}",
+    ".foo{color:red;}
+.bar{color:coral;}",
+  ],
+  "version": 3,
+}
+`;
+
+exports[`worker should work options.minify function: css 1`] = `".minify {};"`;
+
+exports[`worker should work options.minify function: map 1`] = `undefined`;
diff --git a/test/cache-option.test.js b/test/cache-option.test.js
new file mode 100644
index 0000000..17d45c4
--- /dev/null
+++ b/test/cache-option.test.js
@@ -0,0 +1,329 @@
+import cacache from 'cacache';
+import findCacheDir from 'find-cache-dir';
+
+import Webpack4Cache from '../src/Webpack4Cache';
+import CssnanoPlugin from '../src/index';
+
+import {
+  compile,
+  getCompiler,
+  getErrors,
+  getWarnings,
+  readAssets,
+  removeCache,
+} from './helpers';
+
+const uniqueCacheDirectory = findCacheDir({ name: 'unique-cache-directory' });
+const uniqueOtherDirectory = findCacheDir({
+  name: 'unique-other-cache-directory',
+});
+const otherCacheDir = findCacheDir({ name: 'other-cache-directory' });
+const otherOtherCacheDir = findCacheDir({
+  name: 'other-other-cache-directory',
+});
+const otherOtherOtherCacheDir = findCacheDir({
+  name: 'other-other-other-cache-directory',
+});
+
+jest.setTimeout(30000);
+
+if (getCompiler.isWebpack4()) {
+  describe('cache option', () => {
+    let compiler;
+
+    beforeEach(() => {
+      compiler = getCompiler({
+        entry: {
+          one: `${__dirname}/fixtures/cache.js`,
+          two: `${__dirname}/fixtures/cache-1.js`,
+          three: `${__dirname}/fixtures/cache-2.js`,
+          four: `${__dirname}/fixtures/cache-3.js`,
+          five: `${__dirname}/fixtures/cache-4.js`,
+        },
+      });
+
+      return Promise.all([
+        removeCache(),
+        removeCache(uniqueCacheDirectory),
+        removeCache(uniqueOtherDirectory),
+        removeCache(otherCacheDir),
+        removeCache(otherOtherCacheDir),
+        removeCache(otherOtherOtherCacheDir),
+      ]);
+    });
+
+    afterEach(() => {
+      return Promise.all([
+        removeCache(),
+        removeCache(uniqueCacheDirectory),
+        removeCache(uniqueOtherDirectory),
+        removeCache(otherCacheDir),
+        removeCache(otherOtherCacheDir),
+        removeCache(otherOtherOtherCacheDir),
+      ]);
+    });
+
+    it('should match snapshot when a value is not specify', async () => {
+      const cacacheGetSpy = jest.spyOn(cacache, 'get');
+      const cacachePutSpy = jest.spyOn(cacache, 'put');
+
+      const getCacheDirectorySpy = jest
+        .spyOn(Webpack4Cache, 'getCacheDirectory')
+        .mockImplementation(() => uniqueCacheDirectory);
+
+      new CssnanoPlugin().apply(compiler);
+
+      const stats = await compile(compiler);
+
+      expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const countAssets = Object.keys(readAssets(compiler, stats, '.css'))
+        .length;
+
+      // Try to found cached files, but we don't have their in cache
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(countAssets);
+      // Put files in cache
+      expect(cacachePutSpy).toHaveBeenCalledTimes(countAssets);
+
+      cacache.get.mockClear();
+      cacache.put.mockClear();
+
+      const newStats = await compile(compiler);
+
+      expect(readAssets(compiler, newStats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const newCountAssets = Object.keys(readAssets(compiler, newStats, '.css'))
+        .length;
+
+      // Now we have cached files so we get them and don't put new
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(newCountAssets);
+      expect(cacachePutSpy).toHaveBeenCalledTimes(0);
+
+      cacacheGetSpy.mockRestore();
+      cacachePutSpy.mockRestore();
+      getCacheDirectorySpy.mockRestore();
+    });
+
+    it('should match snapshot for the "false" value', async () => {
+      const cacacheGetSpy = jest.spyOn(cacache, 'get');
+      const cacachePutSpy = jest.spyOn(cacache, 'put');
+
+      new CssnanoPlugin({ cache: false }).apply(compiler);
+
+      const stats = await compile(compiler);
+
+      expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      // Cache disabled so we don't run `get` or `put`
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(0);
+      expect(cacachePutSpy).toHaveBeenCalledTimes(0);
+
+      cacacheGetSpy.mockRestore();
+      cacachePutSpy.mockRestore();
+    });
+
+    it('should match snapshot for the "true" value', async () => {
+      const cacacheGetSpy = jest.spyOn(cacache, 'get');
+      const cacachePutSpy = jest.spyOn(cacache, 'put');
+
+      const getCacheDirectorySpy = jest
+        .spyOn(Webpack4Cache, 'getCacheDirectory')
+        .mockImplementation(() => {
+          return uniqueOtherDirectory;
+        });
+
+      new CssnanoPlugin({ cache: true }).apply(compiler);
+
+      const stats = await compile(compiler);
+
+      expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const countAssets = Object.keys(readAssets(compiler, stats, '.css'))
+        .length;
+
+      // Try to found cached files, but we don't have their in cache
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(countAssets);
+      // Put files in cache
+      expect(cacachePutSpy).toHaveBeenCalledTimes(countAssets);
+
+      cacache.get.mockClear();
+      cacache.put.mockClear();
+
+      const newStats = await compile(compiler);
+
+      expect(readAssets(compiler, newStats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const newCountAssets = Object.keys(readAssets(compiler, newStats, '.css'))
+        .length;
+
+      // Now we have cached files so we get them and don't put new
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(newCountAssets);
+      expect(cacachePutSpy).toHaveBeenCalledTimes(0);
+
+      cacacheGetSpy.mockRestore();
+      cacachePutSpy.mockRestore();
+      getCacheDirectorySpy.mockRestore();
+    });
+
+    it('should match snapshot for the "other-cache-directory" value', async () => {
+      const cacacheGetSpy = jest.spyOn(cacache, 'get');
+      const cacachePutSpy = jest.spyOn(cacache, 'put');
+
+      new CssnanoPlugin({ cache: otherCacheDir }).apply(compiler);
+
+      const stats = await compile(compiler);
+
+      expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const countAssets = Object.keys(readAssets(compiler, stats, '.css'))
+        .length;
+
+      // Try to found cached files, but we don't have their in cache
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(countAssets);
+      // Put files in cache
+      expect(cacachePutSpy).toHaveBeenCalledTimes(countAssets);
+
+      cacache.get.mockClear();
+      cacache.put.mockClear();
+
+      const newStats = await compile(compiler);
+
+      expect(readAssets(compiler, newStats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const newCountAssets = Object.keys(readAssets(compiler, newStats, '.css'))
+        .length;
+
+      // Now we have cached files so we get them and don't put new
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(newCountAssets);
+      expect(cacachePutSpy).toHaveBeenCalledTimes(0);
+
+      cacacheGetSpy.mockRestore();
+      cacachePutSpy.mockRestore();
+    });
+
+    it('should match snapshot when "cacheKey" is custom "function"', async () => {
+      const cacacheGetSpy = jest.spyOn(cacache, 'get');
+      const cacachePutSpy = jest.spyOn(cacache, 'put');
+
+      new CssnanoPlugin({
+        cache: otherOtherCacheDir,
+        cacheKeys: (defaultCacheKeys, file) => {
+          // eslint-disable-next-line no-param-reassign
+          defaultCacheKeys.myCacheKey = 1;
+          // eslint-disable-next-line no-param-reassign
+          defaultCacheKeys.myCacheKeyBasedOnFile = `file-${file}`;
+
+          return defaultCacheKeys;
+        },
+      }).apply(compiler);
+
+      const stats = await compile(compiler);
+
+      expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const countAssets = Object.keys(readAssets(compiler, stats, '.css'))
+        .length;
+
+      // Try to found cached files, but we don't have their in cache
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(countAssets);
+      // Put files in cache
+      expect(cacachePutSpy).toHaveBeenCalledTimes(countAssets);
+
+      cacache.get.mockClear();
+      cacache.put.mockClear();
+
+      const newStats = await compile(compiler);
+
+      expect(readAssets(compiler, newStats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const newCountAssets = Object.keys(readAssets(compiler, newStats, '.css'))
+        .length;
+
+      // Now we have cached files so we get them and don't put new
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(newCountAssets);
+      expect(cacachePutSpy).toHaveBeenCalledTimes(0);
+
+      cacacheGetSpy.mockRestore();
+      cacachePutSpy.mockRestore();
+    });
+
+    it('should match snapshot and invalid cache when entry point was renamed', async () => {
+      const cacacheGetSpy = jest.spyOn(cacache, 'get');
+      const cacachePutSpy = jest.spyOn(cacache, 'put');
+
+      const getCacheDirectorySpy = jest
+        .spyOn(Webpack4Cache, 'getCacheDirectory')
+        .mockImplementation(() => {
+          return otherOtherOtherCacheDir;
+        });
+
+      new CssnanoPlugin({ cache: true }).apply(compiler);
+
+      const stats = await compile(compiler);
+
+      expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const countAssets = Object.keys(readAssets(compiler, stats, '.css'))
+        .length;
+
+      // Try to found cached files, but we don't have their in cache
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(countAssets);
+      // Put files in cache
+      expect(cacachePutSpy).toHaveBeenCalledTimes(countAssets);
+
+      cacache.get.mockClear();
+      cacache.put.mockClear();
+
+      compiler = getCompiler({
+        entry: {
+          onne: `${__dirname}/fixtures/cache.js`,
+          two: `${__dirname}/fixtures/cache-1.js`,
+          three: `${__dirname}/fixtures/cache-2.js`,
+          four: `${__dirname}/fixtures/cache-3.js`,
+          five: `${__dirname}/fixtures/cache-4.js`,
+        },
+      });
+
+      new CssnanoPlugin({ cache: true }).apply(compiler);
+
+      const newStats = await compile(compiler);
+
+      expect(readAssets(compiler, newStats, '.css')).toMatchSnapshot('assets');
+      expect(getErrors(stats)).toMatchSnapshot('errors');
+      expect(getWarnings(stats)).toMatchSnapshot('warnings');
+
+      const newCountAssets = Object.keys(readAssets(compiler, newStats, '.css'))
+        .length;
+
+      // Now we have cached files so we get them and don't put new
+      expect(cacacheGetSpy).toHaveBeenCalledTimes(newCountAssets);
+      expect(cacachePutSpy).toHaveBeenCalledTimes(1);
+
+      cacacheGetSpy.mockRestore();
+      cacachePutSpy.mockRestore();
+      getCacheDirectorySpy.mockRestore();
+    });
+  });
+} else {
+  test.skip('skip it', () => {});
+}
diff --git a/test/cjs.test.js b/test/cjs.test.js
new file mode 100644
index 0000000..3893b51
--- /dev/null
+++ b/test/cjs.test.js
@@ -0,0 +1,8 @@
+import src from '../src';
+import cjs from '../src/cjs';
+
+describe('CJS', () => {
+  it('should export loader', () => {
+    expect(cjs).toEqual(src);
+  });
+});
diff --git a/test/cssnanoOptions-option.test.js b/test/cssnanoOptions-option.test.js
index 97f22ad..8300c7c 100644
--- a/test/cssnanoOptions-option.test.js
+++ b/test/cssnanoOptions-option.test.js
@@ -1,18 +1,16 @@
 import CssnanoPlugin from '../src/index';
 
-import { createCompiler, compile } from './compiler';
+import { getCompiler, compile, readAsset, removeCache } from './helpers';
 
-import { readAsset, removeCache } from './helpers';
+jest.setTimeout(30000);
 
 describe('when applied with "cssnanoOptions" option', () => {
-  jest.setTimeout(30000);
-
   beforeEach(() => Promise.all([removeCache()]));
 
   afterEach(() => Promise.all([removeCache()]));
 
   it('matches snapshot for "discardComments" option (enable [default])', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/discardComments.css`,
       },
@@ -32,7 +30,7 @@ describe('when applied with "cssnanoOptions" option', () => {
   });
 
   it('matches snapshot for "discardComments" option (disable)', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/discardComments.css`,
       },
@@ -56,7 +54,7 @@ describe('when applied with "cssnanoOptions" option', () => {
   });
 
   it('matches snapshot for "discardComments" option (enable, with "removeAll" option)', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/discardComments.css`,
       },
@@ -80,7 +78,7 @@ describe('when applied with "cssnanoOptions" option', () => {
   });
 
   it('matches snapshot for "mergeRules" option (enable [default])', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/mergeRules.css`,
       },
@@ -100,7 +98,7 @@ describe('when applied with "cssnanoOptions" option', () => {
   });
 
   it('matches snapshot for "mergeRules" option (disable)', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/mergeRules.css`,
       },
@@ -124,7 +122,7 @@ describe('when applied with "cssnanoOptions" option', () => {
   });
 
   it('matches snapshot for "discardEmpty" option (enable [default])', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/discardEmpty.css`,
       },
@@ -144,7 +142,7 @@ describe('when applied with "cssnanoOptions" option', () => {
   });
 
   it('matches snapshot for "discardEmpty" option (disable)', () => {
-    const compiler = createCompiler({
+    const compiler = getCompiler({
       entry: {
         entry: `${__dirname}/fixtures/cssnanooptions/discardEmpty.css`,
       },
diff --git a/test/exclude-option.test.js b/test/exclude-option.test.js
new file mode 100644
index 0000000..7fc8a98
--- /dev/null
+++ b/test/exclude-option.test.js
@@ -0,0 +1,76 @@
+import CssnanoPlugin from '../src/index';
+
+import {
+  compile,
+  getCompiler,
+  getErrors,
+  getWarnings,
+  readAssets,
+  removeCache,
+} from './helpers';
+
+describe('exclude option', () => {
+  let compiler;
+
+  beforeEach(() => {
+    compiler = getCompiler({
+      entry: {
+        excluded1: `${__dirname}/fixtures/excluded1.js`,
+        excluded2: `${__dirname}/fixtures/excluded2.js`,
+        entry: `${__dirname}/fixtures/entry.js`,
+      },
+    });
+
+    return Promise.all([removeCache()]);
+  });
+
+  afterEach(() => Promise.all([removeCache()]));
+
+  it('should match snapshot for a single RegExp value excluded1', async () => {
+    new CssnanoPlugin({
+      exclude: /excluded1/i,
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for a single String value excluded1', async () => {
+    new CssnanoPlugin({
+      exclude: 'excluded1',
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for multiple RegExp values excluded1 and excluded2', async () => {
+    new CssnanoPlugin({
+      exclude: [/excluded1/i, /excluded2/i],
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for multiple String values excluded1 and excluded2', async () => {
+    new CssnanoPlugin({
+      exclude: ['excluded1', 'excluded2'],
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+});
diff --git a/test/fixtures/cache-1.js b/test/fixtures/cache-1.js
new file mode 100644
index 0000000..4d630e8
--- /dev/null
+++ b/test/fixtures/cache-1.js
@@ -0,0 +1,3 @@
+import css from './test/foo.css';
+
+module.exports = css;
diff --git a/test/fixtures/cache-2.js b/test/fixtures/cache-2.js
new file mode 100644
index 0000000..d116312
--- /dev/null
+++ b/test/fixtures/cache-2.js
@@ -0,0 +1,3 @@
+import css from './test/bar1.css';
+
+module.exports = css;
diff --git a/test/fixtures/cache-3.js b/test/fixtures/cache-3.js
new file mode 100644
index 0000000..4d4f1fe
--- /dev/null
+++ b/test/fixtures/cache-3.js
@@ -0,0 +1,3 @@
+import css from './test/bar2.css';
+
+module.exports = css;
diff --git a/test/fixtures/cache-4.js b/test/fixtures/cache-4.js
new file mode 100644
index 0000000..d116312
--- /dev/null
+++ b/test/fixtures/cache-4.js
@@ -0,0 +1,3 @@
+import css from './test/bar1.css';
+
+module.exports = css;
diff --git a/test/fixtures/cache.js b/test/fixtures/cache.js
new file mode 100644
index 0000000..4d630e8
--- /dev/null
+++ b/test/fixtures/cache.js
@@ -0,0 +1,3 @@
+import css from './test/foo.css';
+
+module.exports = css;
diff --git a/test/fixtures/entry.js b/test/fixtures/entry.js
new file mode 100644
index 0000000..b73ef60
--- /dev/null
+++ b/test/fixtures/entry.js
@@ -0,0 +1,3 @@
+import css from './foo.css';
+
+module.exports = css;
diff --git a/test/fixtures/excluded1.js b/test/fixtures/excluded1.js
new file mode 100644
index 0000000..4d630e8
--- /dev/null
+++ b/test/fixtures/excluded1.js
@@ -0,0 +1,3 @@
+import css from './test/foo.css';
+
+module.exports = css;
diff --git a/test/fixtures/excluded2.js b/test/fixtures/excluded2.js
new file mode 100644
index 0000000..d116312
--- /dev/null
+++ b/test/fixtures/excluded2.js
@@ -0,0 +1,3 @@
+import css from './test/bar1.css';
+
+module.exports = css;
diff --git a/test/fixtures/included1.js b/test/fixtures/included1.js
new file mode 100644
index 0000000..4d630e8
--- /dev/null
+++ b/test/fixtures/included1.js
@@ -0,0 +1,3 @@
+import css from './test/foo.css';
+
+module.exports = css;
diff --git a/test/fixtures/included2.js b/test/fixtures/included2.js
new file mode 100644
index 0000000..d116312
--- /dev/null
+++ b/test/fixtures/included2.js
@@ -0,0 +1,3 @@
+import css from './test/bar1.css';
+
+module.exports = css;
diff --git a/test/fixtures/test/error.css b/test/fixtures/test/error.css
new file mode 100644
index 0000000..19765bd
--- /dev/null
+++ b/test/fixtures/test/error.css
@@ -0,0 +1 @@
+null
diff --git a/test/helpers/compile.js b/test/helpers/compile.js
new file mode 100644
index 0000000..a7fb43b
--- /dev/null
+++ b/test/helpers/compile.js
@@ -0,0 +1,8 @@
+export default function compile(compiler) {
+  return new Promise((resolve, reject) => {
+    compiler.run((err, stats) => {
+      if (err) return reject(err);
+      return resolve(stats);
+    });
+  });
+}
diff --git a/test/compiler.js b/test/helpers/getCompiler.js
similarity index 75%
rename from test/compiler.js
rename to test/helpers/getCompiler.js
index 834ffc8..f27d59f 100644
--- a/test/compiler.js
+++ b/test/helpers/getCompiler.js
@@ -4,26 +4,18 @@ import webpack from 'webpack';
 import MiniCssExtractPlugin from 'mini-css-extract-plugin';
 import { createFsFromVolume, Volume } from 'memfs';
 
-module.exports.compile = (compiler) => {
-  return new Promise((resolve, reject) => {
-    compiler.run((err, stats) => {
-      if (err) return reject(err);
-      return resolve(stats);
-    });
-  });
-};
-
-module.exports.createCompiler = (options) => {
+export default function getCompiler(options) {
   const compiler = webpack({
     mode: 'production',
     bail: true,
-    cache: false,
+    cache: getCompiler.isWebpack4() ? false : { type: 'memory' },
     optimization: {
       minimize: false,
+      noEmitOnErrors: false,
     },
     output: {
       pathinfo: false,
-      path: `${__dirname}/dist`,
+      path: path.resolve(__dirname, 'dist'),
       filename: '[name].js',
       chunkFilename: '[id].[name].js',
     },
@@ -51,4 +43,6 @@ module.exports.createCompiler = (options) => {
   compiler.outputFileSystem = outputFileSystem;
 
   return compiler;
-};
+}
+
+getCompiler.isWebpack4 = () => webpack.version[0] === '4';
diff --git a/test/helpers/getErrors.js b/test/helpers/getErrors.js
new file mode 100644
index 0000000..085bae5
--- /dev/null
+++ b/test/helpers/getErrors.js
@@ -0,0 +1,5 @@
+import normalizeErrors from './normalizeErrors';
+
+export default (stats) => {
+  return normalizeErrors(stats.compilation.errors).sort();
+};
diff --git a/test/helpers/getWarnings.js b/test/helpers/getWarnings.js
new file mode 100644
index 0000000..9e09c82
--- /dev/null
+++ b/test/helpers/getWarnings.js
@@ -0,0 +1,5 @@
+import normalizeErrors from './normalizeErrors';
+
+export default (stats) => {
+  return normalizeErrors(stats.compilation.warnings).sort();
+};
diff --git a/test/helpers/index.js b/test/helpers/index.js
index 1ea198f..31e9ac1 100644
--- a/test/helpers/index.js
+++ b/test/helpers/index.js
@@ -1,5 +1,21 @@
+import compile from './compile';
+import getCompiler from './getCompiler';
 import readAsset from './readAsset';
+import readAssets from './readAssets';
 import normalizedSourceMap from './normalizedSourceMap';
 import removeCache from './removeCache';
+import getErrors from './getErrors';
+import getWarnings from './getWarnings';
+import normalizeErrors from './normalizeErrors';
 
-export { readAsset, normalizedSourceMap, removeCache };
+export {
+  compile,
+  getCompiler,
+  readAsset,
+  readAssets,
+  normalizedSourceMap,
+  removeCache,
+  getErrors,
+  getWarnings,
+  normalizeErrors,
+};
diff --git a/test/helpers/normalizeErrors.js b/test/helpers/normalizeErrors.js
new file mode 100644
index 0000000..c6d0f16
--- /dev/null
+++ b/test/helpers/normalizeErrors.js
@@ -0,0 +1,19 @@
+function removeCWD(str) {
+  const isWin = process.platform === 'win32';
+  let cwd = process.cwd();
+
+  if (isWin) {
+    // eslint-disable-next-line no-param-reassign
+    str = str.replace(/\\/g, '/');
+    // eslint-disable-next-line no-param-reassign
+    cwd = cwd.replace(/\\/g, '/');
+  }
+
+  return str.replace(new RegExp(cwd, 'g'), '');
+}
+
+export default (errors) => {
+  return errors.map((error) =>
+    removeCWD(error.toString().split('\n').slice(0, 2).join('\n'))
+  );
+};
diff --git a/test/helpers/readAssets.js b/test/helpers/readAssets.js
new file mode 100644
index 0000000..e625d84
--- /dev/null
+++ b/test/helpers/readAssets.js
@@ -0,0 +1,15 @@
+import readAsset from './readAsset';
+
+export default function readAssets(compiler, stats, extension) {
+  const assets = {};
+
+  Object.keys(stats.compilation.assets).forEach((asset) => {
+    if (typeof extension === 'undefined') {
+      assets[asset] = readAsset(asset, compiler, stats);
+    } else if (asset.endsWith(extension)) {
+      assets[asset] = readAsset(asset, compiler, stats);
+    }
+  });
+
+  return assets;
+}
diff --git a/test/helpers/snapshotResolver.js b/test/helpers/snapshotResolver.js
new file mode 100644
index 0000000..742ee5b
--- /dev/null
+++ b/test/helpers/snapshotResolver.js
@@ -0,0 +1,28 @@
+const path = require('path');
+
+const webpack = require('webpack');
+
+// eslint-disable-next-line global-require
+const [webpackVersion] = webpack.version;
+const snapshotExtension = `.snap.webpack${webpackVersion}`;
+
+// eslint-disable-next-line no-console
+console.log('Current webpack version:', webpackVersion);
+
+module.exports = {
+  resolveSnapshotPath: (testPath) =>
+    path.join(
+      path.dirname(testPath),
+      '__snapshots__',
+      `${path.basename(testPath)}${snapshotExtension}`
+    ),
+  resolveTestPath: (snapshotPath) =>
+    snapshotPath
+      .replace(`${path.sep}__snapshots__`, '')
+      .slice(0, -snapshotExtension.length),
+  testPathForConsistencyCheck: path.join(
+    'consistency_check',
+    '__tests__',
+    'example.test.js'
+  ),
+};
diff --git a/test/include-option.test.js b/test/include-option.test.js
new file mode 100644
index 0000000..c762476
--- /dev/null
+++ b/test/include-option.test.js
@@ -0,0 +1,76 @@
+import CssnanoPlugin from '../src/index';
+
+import {
+  compile,
+  getCompiler,
+  getErrors,
+  getWarnings,
+  readAssets,
+  removeCache,
+} from './helpers';
+
+describe('include option', () => {
+  let compiler;
+
+  beforeEach(() => {
+    compiler = getCompiler({
+      entry: {
+        included1: `${__dirname}/fixtures/included1.js`,
+        included2: `${__dirname}/fixtures/included2.js`,
+        entry: `${__dirname}/fixtures/entry.js`,
+      },
+    });
+
+    return Promise.all([removeCache()]);
+  });
+
+  afterEach(() => Promise.all([removeCache()]));
+
+  it('should match snapshot for a single RegExp value included1', async () => {
+    new CssnanoPlugin({
+      include: /included1/i,
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for a single String value included1', async () => {
+    new CssnanoPlugin({
+      include: 'included1',
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for multiple RegExp values included1 and included2', async () => {
+    new CssnanoPlugin({
+      include: [/included1/i, /included2/i],
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for multiple String values included1 and included2', async () => {
+    new CssnanoPlugin({
+      include: ['included1', 'included2'],
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+});
diff --git a/test/parallel-option.test.js b/test/parallel-option.test.js
new file mode 100644
index 0000000..ca9984b
--- /dev/null
+++ b/test/parallel-option.test.js
@@ -0,0 +1,252 @@
+import os from 'os';
+
+import Worker from 'jest-worker';
+
+import CssnanoPlugin from '../src/index';
+
+import {
+  compile,
+  getCompiler,
+  getErrors,
+  getWarnings,
+  readAssets,
+  removeCache,
+} from './helpers';
+
+jest.mock('os', () => {
+  const actualOs = jest.requireActual('os');
+
+  actualOs.cpus = jest.fn(() => {
+    return { length: 4 };
+  });
+
+  return actualOs;
+});
+
+// Based on https://github.com/facebook/jest/blob/edde20f75665c2b1e3c8937f758902b5cf28a7b4/packages/jest-runner/src/__tests__/test_runner.test.js
+let workerTransform;
+let workerEnd;
+
+jest.mock('jest-worker', () => {
+  return jest.fn().mockImplementation((workerPath) => {
+    return {
+      // eslint-disable-next-line global-require, import/no-dynamic-require
+      transform: (workerTransform = jest.fn((data) =>
+        // eslint-disable-next-line global-require, import/no-dynamic-require
+        require(workerPath).transform(data)
+      )),
+      end: (workerEnd = jest.fn()),
+      getStderr: jest.fn(),
+      getStdout: jest.fn(),
+    };
+  });
+});
+
+const workerPath = require.resolve('../src/minify');
+
+jest.setTimeout(30000);
+
+describe('parallel option', () => {
+  let compiler;
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+
+    compiler = getCompiler({
+      entry: {
+        one: `${__dirname}/fixtures/entry.js`,
+        two: `${__dirname}/fixtures/entry.js`,
+        three: `${__dirname}/fixtures/entry.js`,
+        four: `${__dirname}/fixtures/entry.js`,
+      },
+    });
+
+    return Promise.all([removeCache()]);
+  });
+
+  afterEach(() => Promise.all([removeCache()]));
+
+  it('should match snapshot when a value is not specify', async () => {
+    new CssnanoPlugin().apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: os.cpus().length - 1,
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "false" value', async () => {
+    new CssnanoPlugin({ parallel: false }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(0);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "true" value', async () => {
+    new CssnanoPlugin({ parallel: true }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: Math.min(4, os.cpus().length - 1),
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "2" value', async () => {
+    new CssnanoPlugin({ parallel: 2 }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: 2,
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "true" value when only one file passed', async () => {
+    compiler = getCompiler({
+      entry: `${__dirname}/fixtures/entry.js`,
+    });
+
+    new CssnanoPlugin({ parallel: true }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: Math.min(1, os.cpus().length - 1),
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "true" value and the number of files is less than the number of cores', async () => {
+    const entries = {};
+
+    for (let i = 0; i < os.cpus().length / 2; i++) {
+      entries[`entry-${i}`] = `${__dirname}/fixtures/entry.js`;
+    }
+
+    compiler = getCompiler({ entry: entries });
+
+    new CssnanoPlugin({ parallel: true }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: Math.min(Object.keys(entries).length, os.cpus().length - 1),
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "true" value and the number of files is same than the number of cores', async () => {
+    const entries = {};
+
+    for (let i = 0; i < os.cpus().length; i++) {
+      entries[`entry-${i}`] = `${__dirname}/fixtures/entry.js`;
+    }
+
+    compiler = getCompiler({ entry: entries });
+
+    new CssnanoPlugin({ parallel: true }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: Math.min(Object.keys(entries).length, os.cpus().length - 1),
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+
+  it('should match snapshot for the "true" value and the number of files is more than the number of cores', async () => {
+    const entries = {};
+
+    for (let i = 0; i < os.cpus().length * 2; i++) {
+      entries[`entry-${i}`] = `${__dirname}/fixtures/entry.js`;
+    }
+
+    compiler = getCompiler({
+      entry: {
+        one: `${__dirname}/fixtures/entry.js`,
+        two: `${__dirname}/fixtures/entry.js`,
+        three: `${__dirname}/fixtures/entry.js`,
+        four: `${__dirname}/fixtures/entry.js`,
+        five: `${__dirname}/fixtures/entry.js`,
+        six: `${__dirname}/fixtures/entry.js`,
+        seven: `${__dirname}/fixtures/entry.js`,
+        eight: `${__dirname}/fixtures/entry.js`,
+      },
+    });
+
+    new CssnanoPlugin({ parallel: true }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(Worker).toHaveBeenCalledTimes(1);
+    expect(Worker).toHaveBeenLastCalledWith(workerPath, {
+      numWorkers: Math.min(Object.keys(entries).length, os.cpus().length - 1),
+    });
+    expect(workerTransform).toHaveBeenCalledTimes(
+      Object.keys(readAssets(compiler, stats, '.css')).length
+    );
+    expect(workerEnd).toHaveBeenCalledTimes(1);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+});
diff --git a/test/sourceMap-option.test.js b/test/sourceMap-option.test.js
index 33cf124..a06529b 100644
--- a/test/sourceMap-option.test.js
+++ b/test/sourceMap-option.test.js
@@ -1,15 +1,21 @@
-import MiniCssExtractPlugin from 'mini-css-extract-plugin';
-
 import webpack from 'webpack';
+import MiniCssExtractPlugin from 'mini-css-extract-plugin';
 
 import CssnanoPlugin from '../src/index';
 
-import { createCompiler, compile } from './compiler';
+import {
+  getCompiler,
+  compile,
+  readAsset,
+  normalizedSourceMap,
+  removeCache,
+  getErrors,
+  getWarnings,
+} from './helpers';
 
-import { readAsset, normalizedSourceMap, removeCache } from './helpers';
+jest.setTimeout(30000);
 
 describe('when applied with "sourceMap" option', () => {
-  jest.setTimeout(30000);
   const baseConfig = {
     devtool: 'source-map',
     entry: {
@@ -37,7 +43,7 @@ describe('when applied with "sourceMap" option', () => {
   afterEach(() => Promise.all([removeCache()]));
 
   it('matches snapshot for "false" value, without previous sourcemap', () => {
-    const compiler = createCompiler(baseConfig);
+    const compiler = getCompiler(baseConfig);
     new CssnanoPlugin().apply(compiler);
 
     return compile(compiler).then((stats) => {
@@ -53,7 +59,7 @@ describe('when applied with "sourceMap" option', () => {
   });
 
   it('matches snapshot for "true" value, without previous sourcemap', () => {
-    const compiler = createCompiler(baseConfig);
+    const compiler = getCompiler(baseConfig);
     new CssnanoPlugin({
       sourceMap: true,
     }).apply(compiler);
@@ -93,7 +99,7 @@ describe('when applied with "sourceMap" option', () => {
       },
     });
 
-    const compiler = createCompiler(config);
+    const compiler = getCompiler(config);
     new CssnanoPlugin({
       sourceMap: false,
     }).apply(compiler);
@@ -126,7 +132,7 @@ describe('when applied with "sourceMap" option', () => {
       },
     });
 
-    const compiler = createCompiler(config);
+    const compiler = getCompiler(config);
     new CssnanoPlugin({
       sourceMap: true,
     }).apply(compiler);
@@ -151,7 +157,7 @@ describe('when applied with "sourceMap" option', () => {
   });
 
   it('matches snapshot for "inline" value', () => {
-    const compiler = createCompiler(baseConfig);
+    const compiler = getCompiler(baseConfig);
     new CssnanoPlugin({
       sourceMap: { inline: true },
     }).apply(compiler);
@@ -202,7 +208,7 @@ describe('when applied with "sourceMap" option', () => {
       ],
     });
 
-    const compiler = createCompiler(config);
+    const compiler = getCompiler(config);
     new CssnanoPlugin({
       sourceMap: true,
     }).apply(compiler);
@@ -218,4 +224,69 @@ describe('when applied with "sourceMap" option', () => {
       }
     });
   });
+
+  it('should emit warning when broken sourcemap', () => {
+    const emitBrokenSourceMapPlugin = new (class EmitBrokenSourceMapPlugin {
+      apply(pluginCompiler) {
+        pluginCompiler.hooks.compilation.tap(
+          { name: this.constructor.name },
+          (compilation) => {
+            compilation.hooks.additionalChunkAssets.tap(
+              { name: this.constructor.name },
+              () => {
+                compilation.additionalChunkAssets.push('broken-source-map.css');
+
+                const assetContent = '.bar {color: red};';
+
+                // eslint-disable-next-line no-param-reassign
+                compilation.assets['broken-source-map.css'] = {
+                  size() {
+                    return assetContent.length;
+                  },
+                  source() {
+                    return assetContent;
+                  },
+                  sourceAndMap() {
+                    return {
+                      source: this.source(),
+                      map: {
+                        sources: [],
+                        names: [],
+                        mappings: 'AAAA,KAAK,iBAAiB,KAAK,UAAU,OAAO',
+                        file: 'x',
+                        sourcesContent: [],
+                      },
+                    };
+                  },
+                };
+              }
+            );
+          }
+        );
+      }
+    })();
+
+    const config = Object.assign(baseConfig, {
+      entry: {
+        entry2: `${__dirname}/fixtures/sourcemap/foo.css`,
+      },
+      plugins: [
+        emitBrokenSourceMapPlugin,
+        new MiniCssExtractPlugin({
+          filename: 'dist/[name].css',
+          chunkFilename: 'dist/[id].[name].css',
+        }),
+      ],
+    });
+
+    const compiler = getCompiler(config);
+    new CssnanoPlugin({
+      sourceMap: true,
+    }).apply(compiler);
+
+    return compile(compiler).then((stats) => {
+      expect(getErrors(stats)).toMatchSnapshot('error');
+      expect(getWarnings(stats)).toMatchSnapshot('warning');
+    });
+  });
 });
diff --git a/test/test-option.test.js b/test/test-option.test.js
index 7afa5f2..2a647fd 100644
--- a/test/test-option.test.js
+++ b/test/test-option.test.js
@@ -1,17 +1,16 @@
 import CssnanoPlugin from '../src/index';
 
-import { createCompiler, compile } from './compiler';
+import { getCompiler, compile, readAsset, removeCache } from './helpers';
 
-import { readAsset, removeCache } from './helpers';
+jest.setTimeout(30000);
 
 describe('when applied with "test" option', () => {
-  jest.setTimeout(30000);
   let compiler;
 
   beforeEach(() => {
     Promise.all([removeCache()]);
 
-    compiler = createCompiler({
+    compiler = getCompiler({
       entry: {
         bar1: `${__dirname}/fixtures/test/bar1.css`,
         bar2: `${__dirname}/fixtures/test/bar2.css`,
diff --git a/test/validate-options.test.js b/test/validate-options.test.js
index f80ed74..f88dbf8 100644
--- a/test/validate-options.test.js
+++ b/test/validate-options.test.js
@@ -172,6 +172,14 @@ it('validation', () => {
     new CssnanoWebpackPlugin({ parallel: {} });
   }).toThrowErrorMatchingSnapshot();
 
+  expect(() => {
+    new CssnanoWebpackPlugin({ minify() {} });
+  }).not.toThrow();
+
+  expect(() => {
+    new CssnanoWebpackPlugin({ minify: true });
+  }).toThrowErrorMatchingSnapshot();
+
   expect(() => {
     new CssnanoWebpackPlugin({ unknown: true });
   }).toThrowErrorMatchingSnapshot();
diff --git a/test/warningsFilter-option.test.js b/test/warningsFilter-option.test.js
new file mode 100644
index 0000000..9dfb1cb
--- /dev/null
+++ b/test/warningsFilter-option.test.js
@@ -0,0 +1,63 @@
+import postcss from 'postcss';
+
+import CssnanoPlugin from '../src/index';
+
+import {
+  compile,
+  getCompiler,
+  getErrors,
+  getWarnings,
+  readAssets,
+  removeCache,
+} from './helpers';
+
+describe('warningsFilter option', () => {
+  beforeEach(() => Promise.all([removeCache()]));
+
+  afterEach(() => Promise.all([removeCache()]));
+
+  it('should match snapshot for a "function" value', async () => {
+    const plugin = postcss.plugin('warning-plugin', () => (css, result) => {
+      result.warn(`Warning from ${result.opts.from}`, {
+        plugin: 'warning-plugin',
+      });
+    });
+
+    const compiler = getCompiler({
+      entry: {
+        foo: `${__dirname}/fixtures/test/foo.css`,
+        bar1: `${__dirname}/fixtures/test/bar1.css`,
+        bar2: `${__dirname}/fixtures/test/bar2.css`,
+      },
+    });
+
+    new CssnanoPlugin({
+      parallel: false,
+      minify: (data) => {
+        return postcss([plugin])
+          .process(data.input, data.postcssOptions)
+          .then((result) => {
+            return {
+              css: result.css,
+              map: result.map,
+              error: result.error,
+              warnings: result.warnings(),
+            };
+          });
+      },
+      warningsFilter(warning) {
+        if (/foo/.test(warning.text)) {
+          return false;
+        }
+
+        return true;
+      },
+    }).apply(compiler);
+
+    const stats = await compile(compiler);
+
+    expect(readAssets(compiler, stats, '.css')).toMatchSnapshot('assets');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+  });
+});
diff --git a/test/worker.test.js b/test/worker.test.js
new file mode 100644
index 0000000..30aa6ab
--- /dev/null
+++ b/test/worker.test.js
@@ -0,0 +1,105 @@
+import serialize from 'serialize-javascript';
+
+import { transform } from '../src/minify';
+
+import { normalizeErrors } from './helpers';
+
+describe('worker', () => {
+  it('should minify css', async () => {
+    const options = {
+      input: '.foo{color:red;}\n.bar{color:coral;}',
+      postcssOptions: {
+        from: 'entry.css',
+        to: 'entry.css',
+        map: {
+          prev: {
+            version: 3,
+            sources: ['foo.css', 'bar.css'],
+            names: [],
+            mappings: 'AAAA,KAAK,iBAAiB,KAAK,UAAU,OAAO',
+            file: 'x',
+            sourcesContent: ['.foo{color:red;}', '.bar{color:coral;}'],
+          },
+          inline: false,
+        },
+      },
+      cssnanoOptions: { discardComments: false },
+    };
+    const { css, map } = await transform(serialize(options));
+
+    expect(css).toMatchSnapshot('css');
+    expect(map).toMatchSnapshot('map');
+  });
+
+  it('should work inputSourceMap as prev', async () => {
+    const options = {
+      input: '.foo{color:red;}\n.bar{color:coral;}',
+      postcssOptions: {
+        from: 'entry.css',
+        to: 'entry.css',
+        map: {
+          prev: {
+            version: 3,
+            sources: ['foo.css', 'bar.css'],
+            names: [],
+            mappings: 'AAAA,KAAK,iBAAiB,KAAK,UAAU,OAAO',
+            file: 'x',
+            sourcesContent: ['.foo{color:red;}', '.bar{color:coral;}'],
+          },
+          inline: false,
+        },
+      },
+      cssnanoOptions: { discardComments: false },
+      inputSourceMap: {
+        version: 3,
+        sources: ['foo.css', 'bar.css'],
+        names: [],
+        mappings: 'AAAA,KAAK,iBAAiB,KAAK,UAAU,OAAO',
+        file: 'x',
+        sourcesContent: ['.foo{color:red;}', '.bar{color:coral;}'],
+      },
+    };
+    const { css, map } = await transform(serialize(options));
+
+    expect(css).toMatchSnapshot('css');
+    expect(map).toMatchSnapshot('map');
+  });
+
+  it('should work options.minify function', async () => {
+    const options = {
+      input: '.foo{color:red;}\n.bar{color:coral;}',
+      postcssOptions: {
+        from: 'entry.css',
+        to: 'entry.css',
+      },
+      cssnanoOptions: { discardComments: false },
+      minify: () => {
+        return { css: '.minify {};' };
+      },
+    };
+    const { css, map } = await transform(serialize(options));
+
+    expect(css).toMatchSnapshot('css');
+    expect(map).toMatchSnapshot('map');
+  });
+
+  it('should emit error', async () => {
+    const options = {
+      input: false,
+      postcssOptions: {
+        from: 'entry.css',
+        to: 'entry.css',
+      },
+    };
+
+    try {
+      await transform(serialize(options));
+    } catch (error) {
+      const normalizeError = { ...error };
+
+      normalizeError.message = [error.message.split('\n')];
+
+      expect(normalizeErrors(normalizeError.message)).toMatchSnapshot('error');
+    }
+  });
+});