jest.config.js

/**
 * External dependencies
 */
const glob = require( 'glob' ).sync;

const defaultPlatform = 'android';
const rnPlatform = process.env.TEST_RN_PLATFORM || defaultPlatform;
if ( process.env.TEST_RN_PLATFORM ) {
	// eslint-disable-next-line no-console
	console.log( 'Setting RN platform to: ' + process.env.TEST_RN_PLATFORM );
} else {
	// eslint-disable-next-line no-console
	console.log( 'Setting RN platform to: default (' + defaultPlatform + ')' );
}

const configPath = 'gutenberg/test/native';

const transpiledPackageNames = glob(
	'./gutenberg/packages/*/src/index.{js,ts}'
).map( ( fileName ) => fileName.split( '/' )[ 3 ] );

module.exports = {
	rootDir: '.',
	// Automatically clear mock calls and instances between every test
	clearMocks: true,
	preset: './gutenberg/node_modules/react-native/jest-preset.js',
	setupFiles: [ '<rootDir>/' + configPath + '/setup.js', './jest.setup.js' ],
	setupFilesAfterEnv: [ '<rootDir>/' + configPath + '/setup-after-env.js' ],
	testMatch: [ '<rootDir>/src/**/test/**/*.[jt]s?(x)' ],
	testPathIgnorePatterns: [
		'/node_modules/',
		'<rootDir>/gutenberg/',
		'<rootDir>/jetpack/',
		'/__device-tests__/',
		'/local-helpers/',
	],
	testEnvironmentOptions: {
		url: 'http://localhost/',
	},
	// Add the `Libraries/Utilities` subfolder to the module directories, otherwise haste/jest doesn't find Platform.js on Travis,
	// and add it first so https://github.com/facebook/react-native/blob/v0.60.0/Libraries/react-native/react-native-implementation.js#L324-L326 doesn't pick up the Platform npm module.
	moduleDirectories: [
		'./gutenberg/node_modules/react-native/Libraries/Utilities',
		'./node_modules',
		'./gutenberg/node_modules',
	],
	moduleNameMapper: {
		// Mock the CSS modules. See https://facebook.github.io/jest/docs/en/webpack.html#handling-static-assets
		'\\.(scss)$': '<rootDir>/' + configPath + '/__mocks__/styleMock.js',
		'\\.(jpg|jpeg|png|gif|eot|otf|webp|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
			'<rootDir>/' + configPath + '/__mocks__/fileMock.js',
		[ `@wordpress\\/(${ transpiledPackageNames.join( '|' ) })$` ]:
			'<rootDir>/gutenberg/packages/$1/src',
		'test/helpers$': '<rootDir>/' + configPath + '/helpers.js',
		jetpackConfig:
			'<rootDir>/jetpack/tools/js-tools/jest/jest-jetpack-config.js',
		// Workaround for Jest not having ESM support yet
		// Reference: https://t.ly/9ap_
		uuid: require.resolve( 'uuid' ),
	},
	haste: {
		defaultPlatform: rnPlatform,
		platforms: [ 'android', 'ios', 'native' ],
	},
	transform: {
		'^.+\\.(js|jsx|ts|tsx)$': 'babel-jest',
	},
	transformIgnorePatterns: [
		// This is required for now to have jest transform some of our modules
		// See: https://github.com/wordpress-mobile/gutenberg-mobile/pull/257#discussion_r234978268
		// There is no overloading in jest so we need to rewrite the config from react-native-jest-preset:
		// https://github.com/facebook/react-native/blob/master/jest-preset.json#L20
		'node_modules/(?!(simple-html-tokenizer|@react-native-community|(jest-)?react-native|@react-native|react-clone-referenced-element|is-plain-obj))',
	],
	reporters: [ 'default', 'jest-junit' ],
	watchPlugins: [
		'jest-watch-typeahead/filename',
		'jest-watch-typeahead/testname',
	],
};