library ExceptionsTest; import 'package:unittest/unittest.dart'; import 'package:unittest/html_config.dart'; import 'dart:html'; main() { useHtmlConfiguration(); test('EventException', () { final event = new Event('Event'); // Intentionally do not initialize it! try { document.dispatchEvent(event); } on DomException catch (e) { expect(e.name, DomException.INVALID_STATE); } }); }