tests/html/request_animation_frame_test.dart

// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

library RequestAnimationFrameTest;

import 'package:unittest/unittest.dart';
import 'package:unittest/html_config.dart';
import 'dart:html';

main() {
  useHtmlConfiguration();

  test('oneShot', () {
    var frame = window.requestAnimationFrame(expectAsync((timestamp) {}));
  });

  test('twoShot', () {
    var frame = window.requestAnimationFrame(expectAsync((timestamp1) {
      window.requestAnimationFrame(expectAsync((timestamp2) {
        // Not monotonic on Safari and IE.
        // expect(timestamp2, greaterThan(timestamp1),
        //    reason: 'timestamps ordered');
      }));
    }));
  });

  // How do we test that a callback is never called?  We can't wrap the uncalled
  // callback with 'expectAsync'.  Will request several frames and try
  // cancelling the one that is not the last.
  test('cancel1', () {
    var frame1 = window.requestAnimationFrame((timestamp1) {
      throw new Exception('Should have been cancelled');
    });
    var frame2 = window.requestAnimationFrame(expectAsync((timestamp2) {}));
    window.cancelAnimationFrame(frame1);
  });

  test('cancel2', () {
    var frame1 = window.requestAnimationFrame(expectAsync((timestamp1) {}));
    var frame2 = window.requestAnimationFrame((timestamp2) {
      throw new Exception('Should have been cancelled');
    });
    var frame3 = window.requestAnimationFrame(expectAsync((timestamp3) {}));
    window.cancelAnimationFrame(frame2);
  });
}