pkg/dev_compiler/test/codegen/lib/html/messageevent_test.dart

import 'dart:html';

import 'package:expect/minitest.dart';

main() {
  test('new MessageEvent', () {
      final event = new MessageEvent('type', cancelable: true, data: 'data',
          origin: 'origin', lastEventId: 'lastEventId');

      expect(event.type, equals('type'));
      expect(event.bubbles, isFalse);
      expect(event.cancelable, isTrue);
      expect(event.data, equals('data'));
      expect(event.origin, equals('origin'));
      // IE allows setting this but just ignores it.
      // expect(event.lastEventId, equals('lastEventId'));
      expect(event.source, window);
      // TODO(antonm): accessing ports is not supported yet.
  });
}