1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/animation.dart';
import 'package:flutter/widgets.dart';
import 'animation_tester.dart';
void main() {
test('Can chain tweens', () {
Tween<double> tween = new Tween<double>(begin: 0.30, end: 0.50);
expect(tween, hasOneLineDescription);
Animatable<double> chain = tween.chain(new Tween<double>(begin: 0.50, end: 1.0));
AnimationController controller = new AnimationController(
vsync: const TestVSync(),
);
expect(chain.evaluate(controller), 0.40);
expect(chain, hasOneLineDescription);
});
test('Can animated tweens', () {
Tween<double> tween = new Tween<double>(begin: 0.30, end: 0.50);
AnimationController controller = new AnimationController(
vsync: const TestVSync(),
);
Animation<double> animation = tween.animate(controller);
controller.value = 0.50;
expect(animation.value, 0.40);
expect(animation, hasOneLineDescription);
expect(animation.toStringDetails(), hasOneLineDescription);
});
test('SizeTween', () {
SizeTween tween = new SizeTween(begin: Size.zero, end: const Size(20.0, 30.0));
expect(tween.lerp(0.5), equals(const Size(10.0, 15.0)));
expect(tween, hasOneLineDescription);
});
test('IntTween', () {
IntTween tween = new IntTween(begin: 5, end: 9);
expect(tween.lerp(0.5), 7);
expect(tween.lerp(0.7), 8);
});
}