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
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
// 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/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('Slider can move when tapped', (WidgetTester tester) async {
Key sliderKey = new UniqueKey();
double value = 0.0;
await tester.pumpWidget(
new StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return new Material(
child: new Center(
child: new Slider(
key: sliderKey,
value: value,
onChanged: (double newValue) {
setState(() {
value = newValue;
});
}
)
)
);
}
)
);
expect(value, equals(0.0));
await tester.tap(find.byKey(sliderKey));
expect(value, equals(0.5));
await tester.pump(); // No animation should start.
expect(SchedulerBinding.instance.transientCallbackCount, equals(0));
});
testWidgets('Slider take on discrete values', (WidgetTester tester) async {
Key sliderKey = new UniqueKey();
double value = 0.0;
await tester.pumpWidget(
new StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return new Material(
child: new Center(
child: new Slider(
key: sliderKey,
min: 0.0,
max: 100.0,
divisions: 10,
value: value,
onChanged: (double newValue) {
setState(() {
value = newValue;
});
}
)
)
);
}
)
);
expect(value, equals(0.0));
await tester.tap(find.byKey(sliderKey));
expect(value, equals(50.0));
await tester.scroll(find.byKey(sliderKey), const Offset(5.0, 0.0));
expect(value, equals(50.0));
await tester.scroll(find.byKey(sliderKey), const Offset(40.0, 0.0));
expect(value, equals(80.0));
await tester.pump(); // Starts animation.
expect(SchedulerBinding.instance.transientCallbackCount, greaterThan(0));
await tester.pump(const Duration(milliseconds: 200));
await tester.pump(const Duration(milliseconds: 200));
await tester.pump(const Duration(milliseconds: 200));
await tester.pump(const Duration(milliseconds: 200));
// Animation complete.
expect(SchedulerBinding.instance.transientCallbackCount, equals(0));
});
}