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This makes it possible to substitute 'flutter run' for 'flutter test'
and actually watch a test run on a device.
For any test that depends on flutter_test:
1. Remove any import of 'package:test/test.dart'.
2. Replace `testWidgets('...', (WidgetTester tester) {`
with `testWidgets('...', (WidgetTester tester) async {`
3. Add an "await" in front of calls to any of the following:
* tap()
* tapAt()
* fling()
* flingFrom()
* scroll()
* scrollAt()
* pump()
* pumpWidget()
4. Replace any calls to `tester.flushMicrotasks()` with calls to
`await tester.idle()`.
There's a guarding API that you can use, if you have particularly
complicated tests, to get better error messages. Search for
TestAsyncUtils.
86 lines
2.6 KiB
Dart
86 lines
2.6 KiB
Dart
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/material.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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testWidgets('Slider can move when tapped', (WidgetTester tester) async {
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Key sliderKey = new UniqueKey();
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double value = 0.0;
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await tester.pumpWidget(
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new StatefulBuilder(
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builder: (BuildContext context, StateSetter setState) {
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return new Material(
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child: new Center(
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child: new Slider(
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key: sliderKey,
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value: value,
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onChanged: (double newValue) {
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setState(() {
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value = newValue;
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});
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}
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)
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)
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);
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}
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)
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);
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expect(value, equals(0.0));
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await tester.tap(find.byKey(sliderKey));
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expect(value, equals(0.5));
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await tester.pump(); // No animation should start.
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expect(SchedulerBinding.instance.transientCallbackCount, equals(0));
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});
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testWidgets('Slider take on discrete values', (WidgetTester tester) async {
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Key sliderKey = new UniqueKey();
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double value = 0.0;
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await tester.pumpWidget(
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new StatefulBuilder(
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builder: (BuildContext context, StateSetter setState) {
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return new Material(
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child: new Center(
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child: new Slider(
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key: sliderKey,
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min: 0.0,
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max: 100.0,
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divisions: 10,
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value: value,
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onChanged: (double newValue) {
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setState(() {
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value = newValue;
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});
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}
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)
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)
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);
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}
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)
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);
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expect(value, equals(0.0));
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await tester.tap(find.byKey(sliderKey));
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expect(value, equals(50.0));
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await tester.scroll(find.byKey(sliderKey), const Offset(5.0, 0.0));
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expect(value, equals(50.0));
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await tester.scroll(find.byKey(sliderKey), const Offset(40.0, 0.0));
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expect(value, equals(80.0));
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await tester.pump(); // Starts animation.
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expect(SchedulerBinding.instance.transientCallbackCount, greaterThan(0));
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await tester.pump(const Duration(milliseconds: 200));
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await tester.pump(const Duration(milliseconds: 200));
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await tester.pump(const Duration(milliseconds: 200));
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await tester.pump(const Duration(milliseconds: 200));
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// Animation complete.
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expect(SchedulerBinding.instance.transientCallbackCount, equals(0));
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});
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}
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