Added GraphQL Jest transform

jest.config.js

@@ -20,6 +20,7 @@ module.exports = {
     '^ee(.*)$': '<rootDir>/ee/app/assets/javascripts$1',
     '^helpers(.*)$': '<rootDir>/spec/frontend/helpers$1',
     '^vendor(.*)$': '<rootDir>/vendor/assets/javascripts$1',
+    '\\.(jpg|jpeg|png|svg)$': '<rootDir>/spec/frontend/__mocks__/file_mock.js',
   },
   collectCoverageFrom: ['<rootDir>/app/assets/javascripts/**/*.{js,vue}'],
   coverageDirectory: '<rootDir>/coverage-frontend/',
@@ -30,6 +31,7 @@ module.exports = {
   setupTestFrameworkScriptFile: '<rootDir>/spec/frontend/test_setup.js',
   restoreMocks: true,
   transform: {
+    '^.+\\.(gql|graphql)$': 'jest-transform-graphql',
     '^.+\\.js$': 'babel-jest',
     '^.+\\.vue$': 'vue-jest',
   },

package.json

@@ -72,6 +72,7 @@
     "graphql": "^14.0.2",
     "imports-loader": "^0.8.0",
     "jed": "^1.1.1",
+    "jest-transform-graphql": "^2.1.0",
     "jquery": "^3.2.1",
     "jquery-ujs": "1.2.2",
     "jquery.waitforimages": "^2.2.0",

spec/frontend/__mocks__/file_mock.js

+export default '';

yarn.lock

@@ -6371,6 +6371,11 @@ jest-snapshot@^23.6.0:
     pretty-format "^23.6.0"
     semver "^5.5.0"
 
+jest-transform-graphql@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/jest-transform-graphql/-/jest-transform-graphql-2.1.0.tgz#903cb66bb27bc2772fd3e5dd4f7e9b57230f5829"
+  integrity sha1-kDy2a7J7wncv0+XdT36bVyMPWCk=
+
 jest-util@^23.4.0:
   version "23.4.0"
   resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-23.4.0.tgz#4d063cb927baf0a23831ff61bec2cbbf49793561"