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ui/jest.config.js

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+const _ = require('lodash')
+// Use a random port number for the mock API by default,
+// to support multiple instances of Jest running
+// simultaneously, like during pre-commit lint.
+process.env.MOCK_API_PORT = process.env.MOCK_API_PORT || _.random(9000, 9999)
+
+module.exports = {
+  setupFiles: ['<rootDir>/tests/unit/setup'],
+  globalSetup: '<rootDir>/tests/unit/global-setup',
+  globalTeardown: '<rootDir>/tests/unit/global-teardown',
+  setupFilesAfterEnv: ['<rootDir>/tests/unit/matchers'],
+  testMatch: ['**/(*.)unit.js'],
+  moduleFileExtensions: ['js', 'json', 'vue'],
+  transform: {
+    '^.+\\.vue$': 'vue-jest',
+    '^.+\\.js$': 'babel-jest',
+    '.+\\.(css|scss|jpe?g|png|gif|webp|svg|mp4|webm|ogg|mp3|wav|flac|aac|woff2?|eot|ttf|otf)$':
+      'jest-transform-stub',
+  },
+  moduleNameMapper: require('./aliases.config').jest,
+  snapshotSerializers: ['jest-serializer-vue'],
+  coverageDirectory: '<rootDir>/tests/unit/coverage',
+  collectCoverageFrom: [
+    'src/**/*.{js,vue}',
+    '!**/node_modules/**',
+    '!src/main.js',
+    '!src/app.vue',
+    '!src/router/index.js',
+    '!src/router/routes.js',
+    '!src/state/store.js',
+    '!src/state/helpers.js',
+    '!src/state/modules/index.js',
+    '!src/components/_globals.js',
+  ],
+  // https://facebook.github.io/jest/docs/en/configuration.html#testurl-string
+  // Set the `testURL` to a provided base URL if one exists, or the mock API base URL
+  // Solves: https://stackoverflow.com/questions/42677387/jest-returns-network-error-when-doing-an-authenticated-request-with-axios
+  testURL:
+    process.env.API_BASE_URL || `http://localhost:${process.env.MOCK_API_PORT}`,
+  // https://github.com/jest-community/jest-watch-typeahead
+  watchPlugins: [
+    'jest-watch-typeahead/filename',
+    'jest-watch-typeahead/testname',
+  ],
+  globals: {
+    'vue-jest': {
+      // Compilation errors in the <style> tags of Vue components will
+      // already result in failing builds, so compiling CSS during unit
+      // tests doesn't protect us from anything. It only complicates
+      // and slows down our unit tests.
+      experimentalCSSCompile: false,
+    },
+  },
+}