code-server/lib/vscode/test/unit/electron/renderer.html

<html>

<head>
	<meta charset="utf-8">
	<title>VSCode Tests</title>
	<link href="../../../node_modules/mocha/mocha.css" rel="stylesheet" />
</head>

<body>
	<div id="mocha"></div>
	<script src="../../../node_modules/mocha/mocha.js"></script>

	<script>

		// !!! DO NOT CHANGE !!!
		// Our unit tests may run in environments without
		// display (e.g. from builds) and tests may by
		// accident bring up native dialogs or even open
		// windows. This we cannot allow as it may crash
		// the test run.
		// !!! DO NOT CHANGE !!!
		window.open = function () { throw new Error('window.open() is not supported in tests!'); };
		window.alert = function () { throw new Error('window.alert() is not supported in tests!'); }
		window.confirm = function () { throw new Error('window.confirm() is not supported in tests!'); }

		// Ignore uncaught cancelled promise errors
		window.addEventListener('unhandledrejection', e => {
			const name = e && e.reason && e.reason.name;

			if (name === 'Canceled') {
				e.preventDefault();
				e.stopPropagation();
			}
		});

		mocha.setup({
			ui: 'tdd',
			timeout: 5000,
			forbidOnly: typeof process.env['BUILD_ARTIFACTSTAGINGDIRECTORY'] === 'string' // disallow .only() when running on build machine
		});
		require('./renderer');
	</script>
</body>

</html>