| // Copyright 2014 The Flutter 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_api_samples/widgets/undo_history/undo_history_controller.0.dart' as example; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| void main() { |
| testWidgets('The undo history controller should undo and redo the history changes', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| const example.UndoHistoryControllerExampleApp(), |
| ); |
| |
| // Equals to UndoHistoryState._kThrottleDuration. |
| const Duration kThrottleDuration = Duration(milliseconds: 500); |
| |
| expect(find.byType(TextField), findsOne); |
| expect(find.widgetWithText(TextButton, 'Undo'), findsOne); |
| expect(find.widgetWithText(TextButton, 'Redo'), findsOne); |
| |
| await tester.enterText(find.byType(TextField), '1st change'); |
| await tester.pump(kThrottleDuration); |
| expect(find.text('1st change'), findsOne); |
| |
| await tester.enterText(find.byType(TextField), '2nd change'); |
| await tester.pump(kThrottleDuration); |
| expect(find.text('2nd change'), findsOne); |
| |
| await tester.enterText(find.byType(TextField), '3rd change'); |
| await tester.pump(kThrottleDuration); |
| expect(find.text('3rd change'), findsOne); |
| |
| await tester.tap(find.text('Undo')); |
| await tester.pump(); |
| expect(find.text('2nd change'), findsOne); |
| |
| await tester.tap(find.text('Undo')); |
| await tester.pump(); |
| expect(find.text('1st change'), findsOne); |
| |
| await tester.tap(find.text('Redo')); |
| await tester.pump(); |
| expect(find.text('2nd change'), findsOne); |
| |
| await tester.tap(find.text('Redo')); |
| await tester.pump(); |
| expect(find.text('3rd change'), findsOne); |
| }); |
| } |