samples-dev/swarm/test/swarm_ui_lib/touch/touch_test.dart

// Copyright (c) 2011, 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 touchTests;

import 'dart:html'; // TODO(rnystrom): Only needed to tell architecture.py
// that this is a web test. Come up with cleaner solution.
import 'package:unittest/html_config.dart';
import 'package:unittest/unittest.dart';
import '../../../swarm_ui_lib/touch/touch.dart';

main() {
  useHtmlConfiguration();
  test('Solver', () {
    expect(Solver.solve((x) => x * x, 81, 10), closeTo(9, 0.1));
    expect(Solver.solve((x) => x * x, 0, 10), closeTo(0, 0.1));
    expect(Solver.solve((x) => x * x, 1.5625, 10), closeTo(1.25, 0.1));
    expect(Solver.solve((x) => 1 / x, 10, 1), closeTo(0.1, 0.1));
  });

  group('Momentum', () {
    test('SingleDimensionPhysics', () {
      expect(new SingleDimensionPhysics().solve(0, 0, 1), equals(0));
      expect(new SingleDimensionPhysics().solve(0, 5, 1), equals(0));
      expect(new SingleDimensionPhysics().solve(0, 100, 1), equals(0));
      expect(new SingleDimensionPhysics().solve(0, 100, 0.5), equals(0));
    });

    test('TimeoutMomentum()', () {
      final delegate = new TestMomentumDelegate();
      final momentum = new TimeoutMomentum(null);
    });
  });
}

class TestMomentumDelegate {
  Function onDecelerateCallback;
  Function onDecelerationEndCallback;

  void onDecelerate(num x, num y,
      [num duration = 0, String timingFunction = null]) {
    onDecelerateCallback(x, y, duration, timingFunction);
  }

  /**
   * Callback for end of deceleration.
   */
  void onDecelerationEnd() {
    onDecelerationEndCallback();
  }
}