jest.config.js

// 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: [
    'src/js/**/*.js'
  ],

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

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

  // The path to a module that runs some code to configure or set up the testing framework before each test
  setupFilesAfterEnv: ['<rootDir>/test/unit/setupTests.js'],

  testPathIgnorePatterns: [
    '/node_modules/',
    '/test/cypress/'
  ],

  // A map from regular expressions to paths to transformers
  transform: {
    '^.+\\.js$': 'babel-jest',
    '.+\\.(css|styl|less|sass|scss)$': 'jest-transform-css'
  }
};