jest.config.js

// 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: ["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", "json", "jsx"],

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

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

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

  // This mocks the CSS Modules classes so JEST doesn't fail to import them. Also useful for snapshot testing (different class names don't mess up with the snapshot diff)
  moduleNameMapper: {
    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$":
      "<rootDir>/__mocks__/fileMock.js",
    "\\.(css|less)$": "identity-obj-proxy",
  },

  setupFilesAfterEnv: ["./jest.setup.js"],

  // This option sets the URL for the jsdom environment. It is reflected in properties such as location.href
  testURL: "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/"],

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