jest.config.js

/* eslint-disable max-len */
// For a detailed explanation regarding each configuration property, visit:
// https://jestjs.io/docs/en/configuration.html

module.exports = {
  // Automatically clear mock calls and instances between every test
  clearMocks: true,

  // An array of glob patterns indicating a set of files for which coverage information should be collected
  collectCoverageFrom: ['app/**/*.{js,jsx,mjs}', '"!app/index.js"', 'src/**/*.{js,jsx,mjs}'],

  // The directory where Jest should output its coverage files
  coverageDirectory: 'coverage',

  // An array of file extensions your modules use
  moduleFileExtensions: ['js', 'jsx'],

  // Mock files
  moduleNameMapper: {
    '\\.(css|less|sass|scss)$': '<rootDir>/config/jest/styleMock.js',
    '\\.(gif|ttf|eot|svg|png|ico)$': '<rootDir>/config/jest/fileMock.js',
  },

  // Same with webpack module resolver
  moduleDirectories: ['node_modules', 'app', 'src'],

  // The paths to modules that run some code to configure or set up the testing environment before each test
  setupFiles: ['<rootDir>/config/jest/setupJest.js'],

  // The test environment that will be used for testing
  testEnvironment: 'jsdom',

  // The glob patterns Jest uses to detect test files
  testMatch: ['**/?(*.)+(test).js?(x)'],

  // An array of regexp pattern strings that are matched against all test paths, matched tests are skipped
  testPathIgnorePatterns: ['\\\\node_modules\\\\'],

  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
  testEnvironmentOptions: {
    url: 'http://localhost',
  },

  // An array of regexp pattern strings that are matched against all source file paths, matched files will skip transformation
  transformIgnorePatterns: ['<rootDir>/node_modules/'],

  // ignore watch to include node_modules by mistake.
  watchPathIgnorePatterns: ['<rootDir>/node_modules/'],

  // Indicates whether each individual test should be reported during the run
  verbose: false,
};