woocommerce/packages/js/internal-js-tests/src/setup-window-globals.js

// Check if we're in a JSDOM test or not
if ( global.window ) {
	// These are necessary to load TinyMCE successfully
	global.URL = window.URL;
	global.window.tinyMCEPreInit = {
		// Without this, TinyMCE tries to determine its URL by looking at the
		// <script> tag where it was loaded from, which of course fails here.
		baseURL: 'about:blank',
	};
	global.window.requestAnimationFrame = setTimeout;
	global.window.cancelAnimationFrame = clearTimeout;
	global.window.matchMedia = ( query ) => ( {
		matches: false,
		media: query,
		onchange: null,
		addListener: () => {}, // Deprecated
		removeListener: () => {}, // Deprecated
		addEventListener: () => {},
		removeEventListener: () => {},
		dispatchEvent: () => true,
	} );

	// Setup fake localStorage
	const storage = {};
	global.window.localStorage = {
		getItem: ( key ) => ( key in storage ? storage[ key ] : null ),
		setItem: ( key, value ) => ( storage[ key ] = value ),
	};

	// UserSettings global
	global.window.userSettings = { uid: 1 };
}