diff --git a/.travis.yml b/.travis.yml
index 430b522..1c20491 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,3 +10,5 @@ install:
 script:
   - npm run standard
   - npm test
+after_success: 
+  - npm run coveralls
\ No newline at end of file
diff --git a/README.MD b/README.MD
index 5f3eba6..d1f9f26 100644
--- a/README.MD
+++ b/README.MD
@@ -6,7 +6,7 @@
   <br>
 </h1>
 
-[![Greenkeeper badge](https://badges.greenkeeper.io/EasyGraphQL/easygraphql-tester.svg)](https://greenkeeper.io/)
+[![Coverage Status](https://coveralls.io/repos/github/EasyGraphQL/easygraphql-tester/badge.svg?branch=master)](https://coveralls.io/github/EasyGraphQL/easygraphql-tester?branch=master) [![Greenkeeper badge](https://badges.greenkeeper.io/EasyGraphQL/easygraphql-tester.svg)](https://greenkeeper.io/)
 
 [`easygraphql-tester`](https://github.com/EasyGraphQL/easygraphql-tester) is node library created to make GraphQL tests based on the schema; it's used
 to test the queries, mutations and schema on the easiest way possible.
@@ -225,6 +225,8 @@ The result will have top level fields, it means that the result will be an objec
 with a property that is going to be the name (top level field) of the query or alias with the mocked
 result.
 
+*In case you have a custom scalar, set the value on the fixture, if it's not set it will be `{}`*
+
 ### Mock example
 ```js
 'use strict'
diff --git a/package-lock.json b/package-lock.json
index 092c2f0..6268405 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -198,12 +198,45 @@
         "es-abstract": "1.12.0"
       }
     },
+    "asn1": {
+      "version": "0.2.4",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
+      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
+      "dev": true,
+      "requires": {
+        "safer-buffer": "2.1.2"
+      }
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "dev": true
+    },
     "assertion-error": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
       "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
       "dev": true
     },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
+      "dev": true
+    },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
+      "dev": true
+    },
+    "aws4": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
+      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
+      "dev": true
+    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -263,6 +296,15 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "bcrypt-pbkdf": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
+      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
+      "dev": true,
+      "requires": {
+        "tweetnacl": "0.14.5"
+      }
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -309,6 +351,12 @@
       "integrity": "sha1-BuuE8A7qQT2oav/vrL/7Ngk7PFA=",
       "dev": true
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "dev": true
+    },
     "chai": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
@@ -393,6 +441,15 @@
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
+    "combined-stream": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.7.tgz",
+      "integrity": "sha512-brWl9y6vOB1xYPZcpZde3N9zDByXTosAeMDo4p1wzo6UMOX4vumB+TP1RZ76sfE6Md68Q0NJSrE/gbezd4Ul+w==",
+      "dev": true,
+      "requires": {
+        "delayed-stream": "1.0.0"
+      }
+    },
     "commander": {
       "version": "2.15.1",
       "resolved": "http://registry.npmjs.org/commander/-/commander-2.15.1.tgz",
@@ -411,6 +468,12 @@
       "integrity": "sha1-/ozxhP9mcLa67wGp1IYaXL7EEgo=",
       "dev": true
     },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+      "dev": true
+    },
     "cosmiconfig": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.0.7.tgz",
@@ -423,6 +486,28 @@
         "parse-json": "4.0.0"
       }
     },
+    "coveralls": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/coveralls/-/coveralls-3.0.2.tgz",
+      "integrity": "sha512-Tv0LKe/MkBOilH2v7WBiTBdudg2ChfGbdXafc/s330djpF3zKOmuehTeRwjXWc7pzfj9FrDUTA7tEx6Div8NFw==",
+      "dev": true,
+      "requires": {
+        "growl": "1.10.5",
+        "js-yaml": "3.12.0",
+        "lcov-parse": "0.0.10",
+        "log-driver": "1.2.7",
+        "minimist": "1.2.0",
+        "request": "2.88.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
     "cross-spawn": {
       "version": "6.0.5",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
@@ -436,6 +521,15 @@
         "which": "1.3.1"
       }
     },
+    "dashdash": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
+      "integrity": "sha1-hTz6D3y+L+1d4gMmuN1YEDX24vA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "1.0.0"
+      }
+    },
     "debug": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
@@ -497,6 +591,12 @@
         }
       }
     },
+    "delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
+      "dev": true
+    },
     "diff": {
       "version": "3.5.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
@@ -519,17 +619,38 @@
       "requires": {
         "chance": "1.0.18",
         "easygraphql-parser": "0.0.3"
+      },
+      "dependencies": {
+        "easygraphql-parser": {
+          "version": "0.0.3",
+          "resolved": "https://registry.npmjs.org/easygraphql-parser/-/easygraphql-parser-0.0.3.tgz",
+          "integrity": "sha512-k2QQFgR/XZJb3wAP4wp/CWKoa6ncSofO8MFz9fw8dQYETygBNeVU8/gHQeOn9zTDA4S3Eagu7cd3bPL+zwQhLg==",
+          "requires": {
+            "graphql": "14.0.2",
+            "lodash.mergewith": "4.6.1"
+          }
+        }
       }
     },
     "easygraphql-parser": {
-      "version": "0.0.3",
-      "resolved": "https://registry.npmjs.org/easygraphql-parser/-/easygraphql-parser-0.0.3.tgz",
-      "integrity": "sha512-k2QQFgR/XZJb3wAP4wp/CWKoa6ncSofO8MFz9fw8dQYETygBNeVU8/gHQeOn9zTDA4S3Eagu7cd3bPL+zwQhLg==",
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/easygraphql-parser/-/easygraphql-parser-0.0.5.tgz",
+      "integrity": "sha512-039Mpk6HG2PH3rCsT/rPiQcZPVq4VixK5Yyyae7KDx5+aV425z3qjG6suJs3ipqFIGNMOCUXK2zR5x/I0ALv+w==",
       "requires": {
         "graphql": "14.0.2",
         "lodash.mergewith": "4.6.1"
       }
     },
+    "ecc-jsbn": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/ecc-jsbn/-/ecc-jsbn-0.1.2.tgz",
+      "integrity": "sha1-OoOpBOVDUyh4dMVkt1SThoSamMk=",
+      "dev": true,
+      "requires": {
+        "jsbn": "0.1.1",
+        "safer-buffer": "2.1.2"
+      }
+    },
     "end-of-stream": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
@@ -878,6 +999,12 @@
         "strip-eof": "1.0.0"
       }
     },
+    "extend": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
+      "dev": true
+    },
     "external-editor": {
       "version": "2.2.0",
       "resolved": "http://registry.npmjs.org/external-editor/-/external-editor-2.2.0.tgz",
@@ -889,6 +1016,12 @@
         "tmp": "0.0.33"
       }
     },
+    "extsprintf": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
+      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
+      "dev": true
+    },
     "fast-deep-equal": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
@@ -953,6 +1086,23 @@
         "write": "0.2.1"
       }
     },
+    "forever-agent": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/forever-agent/-/forever-agent-0.6.1.tgz",
+      "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=",
+      "dev": true
+    },
+    "form-data": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.3.tgz",
+      "integrity": "sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==",
+      "dev": true,
+      "requires": {
+        "asynckit": "0.4.0",
+        "combined-stream": "1.0.7",
+        "mime-types": "2.1.21"
+      }
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -992,6 +1142,15 @@
         "pump": "3.0.0"
       }
     },
+    "getpass": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz",
+      "integrity": "sha1-Xv+OPmhNVprkyysSgmBOi6YhSfo=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "1.0.0"
+      }
+    },
     "glob": {
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       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
@@ -1037,6 +1196,22 @@
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       "dev": true
     },
+    "har-schema": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
+      "integrity": "sha1-qUwiJOvKwEeCoNkDVSHyRzW37JI=",
+      "dev": true
+    },
+    "har-validator": {
+      "version": "5.1.3",
+      "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-5.1.3.tgz",
+      "integrity": "sha512-sNvOCzEQNr/qrvJgc3UG/kD4QtlHycrzwS+6mfTrrSq97BvaYcPZZI1ZSqGSPR73Cxn4LKTD4PttRwfU7jWq5g==",
+      "dev": true,
+      "requires": {
+        "ajv": "6.6.2",
+        "har-schema": "2.0.0"
+      }
+    },
     "has": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
@@ -1079,6 +1254,17 @@
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       "dev": true
     },
+    "http-signature": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/http-signature/-/http-signature-1.2.0.tgz",
+      "integrity": "sha1-muzZJRFHcvPZW2WmCruPfBj7rOE=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "1.0.0",
+        "jsprim": "1.4.1",
+        "sshpk": "1.16.0"
+      }
+    },
     "husky": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/husky/-/husky-1.2.1.tgz",
@@ -1249,6 +1435,12 @@
         "has-symbols": "1.0.0"
       }
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+    "is-typedarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-typedarray/-/is-typedarray-1.0.0.tgz",
+      "integrity": "sha1-5HnICFjfDBsR3dppQPlgEfzaSpo=",
+      "dev": true
+    },
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       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
@@ -1261,6 +1453,12 @@
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       "dev": true
     },
+    "isstream": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",
+      "integrity": "sha1-R+Y/evVa+m+S4VAOaQ64uFKcCZo=",
+      "dev": true
+    },
     "istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -1303,6 +1501,12 @@
         "esprima": "4.0.1"
       }
     },
+    "jsbn": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz",
+      "integrity": "sha1-peZUwuWi3rXyAdls77yoDA7y9RM=",
+      "dev": true
+    },
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       "version": "2.5.2",
       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-2.5.2.tgz",
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       "dev": true
     },
+    "json-schema": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/json-schema/-/json-schema-0.2.3.tgz",
+      "integrity": "sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM=",
+      "dev": true
+    },
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       "version": "0.4.1",
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@@ -1327,6 +1537,24 @@
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       "dev": true
     },
+    "json-stringify-safe": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz",
+      "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus=",
+      "dev": true
+    },
+    "jsprim": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
+      "integrity": "sha1-MT5mvB5cwG5Di8G3SZwuXFastqI=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "1.0.0",
+        "extsprintf": "1.3.0",
+        "json-schema": "0.2.3",
+        "verror": "1.10.0"
+      }
+    },
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       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/jsx-ast-utils/-/jsx-ast-utils-2.0.1.tgz",
@@ -1336,6 +1564,12 @@
         "array-includes": "3.0.3"
       }
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+    "lcov-parse": {
+      "version": "0.0.10",
+      "resolved": "https://registry.npmjs.org/lcov-parse/-/lcov-parse-0.0.10.tgz",
+      "integrity": "sha1-GwuP+ayceIklBYK3C3ExXZ2m2aM=",
+      "dev": true
+    },
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     },
+    "log-driver": {
+      "version": "1.2.7",
+      "resolved": "https://registry.npmjs.org/log-driver/-/log-driver-1.2.7.tgz",
+      "integrity": "sha512-U7KCmLdqsGHBLeWqYlFA0V0Sl6P08EE1ZrmA9cxjUE0WVqT9qnyVDPz1kzpFEP0jdJuFnasWIfSd7fsaNXkpbg==",
+      "dev": true
+    },
     "loose-envify": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
@@ -1415,6 +1655,21 @@
         "js-tokens": "4.0.0"
       }
     },
+    "mime-db": {
+      "version": "1.37.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.37.0.tgz",
+      "integrity": "sha512-R3C4db6bgQhlIhPU48fUtdVmKnflq+hRdad7IyKhtFj06VPNVdk2RhiYL3UjQIlso8L+YxAtFkobT0VK+S/ybg==",
+      "dev": true
+    },
+    "mime-types": {
+      "version": "2.1.21",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.21.tgz",
+      "integrity": "sha512-3iL6DbwpyLzjR3xHSFNFeb9Nz/M8WDkX33t1GFQnFOllWk8pOrh/LSrB5OXlnlW5P9LH73X6loW/eogc+F5lJg==",
+      "dev": true,
+      "requires": {
+        "mime-db": "1.37.0"
+      }
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       "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-1.2.0.tgz",
@@ -2648,6 +2903,12 @@
         }
       }
     },
+    "oauth-sign": {
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
+      "integrity": "sha512-fexhUFFPTGV8ybAtSIGbV6gOkSv8UtRbDBnAyLQw4QPKkgNlsH2ByPGtMUqdWkos6YCRmAqViwgZrJc/mRDzZQ==",
+      "dev": true
+    },
     "object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -2791,6 +3052,12 @@
       "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA=",
       "dev": true
     },
+    "performance-now": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
+      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
+      "dev": true
+    },
     "pify": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
@@ -2936,6 +3203,12 @@
         "object-assign": "4.1.1"
       }
     },
+    "psl": {
+      "version": "1.1.31",
+      "resolved": "https://registry.npmjs.org/psl/-/psl-1.1.31.tgz",
+      "integrity": "sha512-/6pt4+C+T+wZUieKR620OpzN/LlnNKuWjy1iFLQ/UG35JqHlR/89MP1d96dUfkf6Dne3TuLQzOYEYshJ+Hx8mw==",
+      "dev": true
+    },
     "pump": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
@@ -2952,6 +3225,12 @@
       "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
       "dev": true
     },
+    "qs": {
+      "version": "6.5.2",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.2.tgz",
+      "integrity": "sha512-N5ZAX4/LxJmF+7wN74pUD6qAh9/wnvdQcjq9TZjevvXzSUo7bfmw91saqMjzGS2xq91/odN2dW/WOl7qQHNDGA==",
+      "dev": true
+    },
     "read-pkg": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-4.0.1.tgz",
@@ -3035,6 +3314,34 @@
       "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==",
       "dev": true
     },
+    "request": {
+      "version": "2.88.0",
+      "resolved": "https://registry.npmjs.org/request/-/request-2.88.0.tgz",
+      "integrity": "sha512-NAqBSrijGLZdM0WZNsInLJpkJokL72XYjUpnB0iwsRgxh7dB6COrHnTBNwN0E+lHDAJzu7kLAkDeY08z2/A0hg==",
+      "dev": true,
+      "requires": {
+        "aws-sign2": "0.7.0",
+        "aws4": "1.8.0",
+        "caseless": "0.12.0",
+        "combined-stream": "1.0.7",
+        "extend": "3.0.2",
+        "forever-agent": "0.6.1",
+        "form-data": "2.3.3",
+        "har-validator": "5.1.3",
+        "http-signature": "1.2.0",
+        "is-typedarray": "1.0.0",
+        "isstream": "0.1.2",
+        "json-stringify-safe": "5.0.1",
+        "mime-types": "2.1.21",
+        "oauth-sign": "0.9.0",
+        "performance-now": "2.1.0",
+        "qs": "6.5.2",
+        "safe-buffer": "5.1.2",
+        "tough-cookie": "2.4.3",
+        "tunnel-agent": "0.6.0",
+        "uuid": "3.3.2"
+      }
+    },
     "require-uncached": {
       "version": "1.0.3",
       "resolved": "http://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
@@ -3132,6 +3439,12 @@
         "symbol-observable": "1.0.1"
       }
     },
+    "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
+    },
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
@@ -3230,6 +3543,23 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
+    "sshpk": {
+      "version": "1.16.0",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.0.tgz",
+      "integrity": "sha512-Zhev35/y7hRMcID/upReIvRse+I9SVhyVre/KTJSJQWMz3C3+G+HpO7m1wK/yckEtujKZ7dS4hkVxAnmHaIGVQ==",
+      "dev": true,
+      "requires": {
+        "asn1": "0.2.4",
+        "assert-plus": "1.0.0",
+        "bcrypt-pbkdf": "1.0.2",
+        "dashdash": "1.14.1",
+        "ecc-jsbn": "0.1.2",
+        "getpass": "0.1.7",
+        "jsbn": "0.1.1",
+        "safer-buffer": "2.1.2",
+        "tweetnacl": "0.14.5"
+      }
+    },
     "standard": {
       "version": "12.0.1",
       "resolved": "https://registry.npmjs.org/standard/-/standard-12.0.1.tgz",
@@ -3368,12 +3698,45 @@
       "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
       "dev": true
     },
+    "tough-cookie": {
+      "version": "2.4.3",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.4.3.tgz",
+      "integrity": "sha512-Q5srk/4vDM54WJsJio3XNn6K2sCG+CQ8G5Wz6bZhRZoAe/+TxjWB/GlFAnYEbkYVlON9FMk/fE3h2RLpPXo4lQ==",
+      "dev": true,
+      "requires": {
+        "psl": "1.1.31",
+        "punycode": "1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true
+        }
+      }
+    },
     "trim-right": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.2"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "dev": true
+    },
     "type-check": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
@@ -3404,6 +3767,12 @@
         "punycode": "2.1.1"
       }
     },
+    "uuid": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -3414,6 +3783,17 @@
         "spdx-expression-parse": "3.0.0"
       }
     },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "dev": true,
+      "requires": {
+        "assert-plus": "1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "1.3.0"
+      }
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
diff --git a/package.json b/package.json
index e619ce8..1bad2fa 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
   "scripts": {
     "test": "nyc --check-coverage --lines 98 mocha",
     "standard": "standard",
-    "standard-fix": "standard --fix"
+    "standard-fix": "standard --fix",
+    "coveralls": "nyc npm test && nyc report --reporter=text-lcov | coveralls"
   },
   "husky": {
     "hooks": {
@@ -34,13 +35,14 @@
   "license": "MIT",
   "dependencies": {
     "easygraphql-mock": "^0.1.5",
-    "easygraphql-parser": "^0.0.3",
+    "easygraphql-parser": "^0.0.5",
     "graphql-tag": "^2.9.2",
     "lodash.isempty": "^4.4.0",
     "lodash.isobject": "^3.0.2"
   },
   "devDependencies": {
     "chai": "^4.1.2",
+    "coveralls": "^3.0.2",
     "husky": "^1.2.1",
     "mocha": "^5.2.0",
     "nyc": "^13.0.1",
diff --git a/test/query.js b/test/query.js
index 403b7fe..ce5860d 100644
--- a/test/query.js
+++ b/test/query.js
@@ -536,6 +536,7 @@ describe('Query', () => {
       const query = `
         {
           getMe {
+            createdAt
             familyInfo {
               id
               isLocal
@@ -544,7 +545,16 @@ describe('Query', () => {
         }
       `
 
-      const { getMe } = tester.mock(query)
+      const { getMe } = tester.mock({
+        query,
+        fixture: {
+          createdAt: '2018-12-27'
+        }
+      })
+
+      expect(getMe.createdAt).to.exist
+      expect(getMe.createdAt).to.be.a('string')
+      expect(getMe.createdAt).to.be.eq('2018-12-27')
       for (const familyInfo of getMe.familyInfo) {
         expect(familyInfo.isLocal).to.be.a('boolean')
       }
diff --git a/test/schema/user.gql b/test/schema/user.gql
index b5bd969..cf89385 100644
--- a/test/schema/user.gql
+++ b/test/schema/user.gql
@@ -1,3 +1,5 @@
+scalar DateTime
+
 union SearchResult = User | FamilyInfo
 
 enum FamilyRelation {
@@ -27,6 +29,7 @@ type Me {
   familyInfo: [FamilyInfo]!
   familyRelation: FamilyRelation!
   user: User!
+  createdAt: DateTime!
 }
 
 input UserInput {
diff --git a/test/tester.js b/test/tester.js
index 27b7875..e99a2a0 100644
--- a/test/tester.js
+++ b/test/tester.js
@@ -41,6 +41,7 @@ describe('Assert test', () => {
         {
           getMeByTestResult(result: 4.9) {
             email
+            createdAt
           }
         }
       `
diff --git a/utils/fixture.js b/utils/fixture.js
index 7dff38e..c62dcbd 100644
--- a/utils/fixture.js
+++ b/utils/fixture.js
@@ -1,4 +1,5 @@
 const isObject = require('lodash.isobject')
+const isEmpty = require('lodash.isempty')
 
 function setFixture (mock, fixture) {
   if (typeof fixture === 'undefined') {
@@ -31,7 +32,9 @@ function handleObjectFixture (mock, fixture) {
       throw new Error(`${val} is not an array and it should be one.`)
     }
 
-    if (mock[val] !== null && typeof mock[val] !== typeof fixture[val]) {
+    // if the mock[val] is empty it is because it's a custom scalar, in this case
+    // it should not be validated
+    if (mock[val] !== null && typeof mock[val] !== typeof fixture[val] && !isEmpty(mock[val])) {
       throw new Error(`${val} is not the same type as the document.`)
     }
 
diff --git a/utils/validator.js b/utils/validator.js
index df146dc..d588349 100644
--- a/utils/validator.js
+++ b/utils/validator.js
@@ -255,7 +255,7 @@ function validateSelectedFields (field, selectedSchema, schema, name, type) {
   }
 
   const selectedType = schema[schemaFields.type]
-  if (selectedType) {
+  if (selectedType && selectedType.type !== 'ScalarTypeDefinition') {
     if (isObject(selectedType) && field.fields.length === 0 && selectedType.values.length === 0) {
       throw new Error(`${type} ${name}: There should be a selected field on ${field.name}`)
     }