docs/jest.config.js

// https://jestjs.io/docs/en/configuration.html

const isBrowser = process.env.BROWSER
const isActions = Boolean(process.env.GITHUB_ACTIONS)
const testTranslation = Boolean(process.env.TEST_TRANSLATION)

const reporters = ['default']

if (testTranslation) {
  // only use custom reporter if we are linting translations
  reporters.push('<rootDir>/tests/helpers/lint-translation-reporter.js')
} else if (isActions) {
  reporters.push('jest-github-actions-reporter')
}

module.exports = {
  coverageThreshold: {
    global: {
      branches: 95,
      functions: 95,
      lines: 95,
      statements: -5
    }
  },
  preset: isBrowser
    ? 'jest-puppeteer'
    : undefined,
  reporters,
  modulePathIgnorePatterns: [
    'assets/'
  ],
  setupFilesAfterEnv: ['jest-expect-message'],
  ...isBrowser ? {} : { testEnvironment: 'node' },
  testPathIgnorePatterns: [
    'node_modules/',
    'vendor/',
    'tests/fixtures/',
    'tests/helpers/',
    'tests/javascripts/',
    ...isBrowser ? [] : ['tests/browser/browser.js']
  ],
  testMatch: [
    '**/tests/**/*.js'
  ],
  testLocationInResults: isActions
}