| // 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/material/scaffold/scaffold_messenger_state.show_snack_bar.1.dart' as example; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| void main() { |
| testWidgets('Floating SnackBar is visible', (WidgetTester tester) async { |
| await tester.pumpWidget( |
| const example.SnackBarApp(), |
| ); |
| |
| final Finder buttonFinder = find.byType(ElevatedButton); |
| await tester.tap(buttonFinder.first); |
| // Have the SnackBar fully animate out. |
| await tester.pumpAndSettle(); |
| |
| final Finder snackBarFinder = find.byType(SnackBar); |
| expect(snackBarFinder, findsOneWidget); |
| |
| // Grow logo to send SnackBar off screen. |
| await tester.tap(buttonFinder.last); |
| await tester.pumpAndSettle(); |
| |
| final AssertionError exception = tester.takeException() as AssertionError; |
| const String message = 'Floating SnackBar presented off screen.\n' |
| 'A SnackBar with behavior property set to SnackBarBehavior.floating is fully ' |
| 'or partially off screen because some or all the widgets provided to ' |
| 'Scaffold.floatingActionButton, Scaffold.persistentFooterButtons and ' |
| 'Scaffold.bottomNavigationBar take up too much vertical space.\n' |
| 'Consider constraining the size of these widgets to allow room for the SnackBar to be visible.'; |
| expect(exception.message, message); |
| }); |
| } |