| // 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/magnifier/magnifier.0.dart' |
| as example; |
| import 'package:flutter_test/flutter_test.dart'; |
| |
| void main() { |
| testWidgets('should update magnifier position on drag', (WidgetTester tester) async { |
| await tester.pumpWidget(const example.MagnifierExampleApp()); |
| |
| Matcher isPositionedAt(Offset at) { |
| return isA<Positioned>().having( |
| (Positioned positioned) => Offset(positioned.left!, positioned.top!), |
| 'magnifier position', |
| at, |
| ); |
| } |
| |
| // Make sure magnifier is present. |
| final Finder positionedWidget = find.byType(Positioned); |
| final Widget positionedWidgetInTree = tester.widget(positionedWidget); |
| final Positioned oldConcretePositioned = positionedWidgetInTree as Positioned; |
| expect(positionedWidget, findsOneWidget); |
| |
| // Confirm if magnifier is in the center of the FlutterLogo. |
| final Offset centerOfPositioned = tester.getCenter(positionedWidget); |
| final Offset centerOfFlutterLogo = tester.getCenter(find.byType(FlutterLogo)); |
| expect(centerOfPositioned, equals(centerOfFlutterLogo)); |
| |
| // Drag the magnifier and confirm its new position is expected. |
| const Offset dragDistance = Offset(10, 10); |
| final Offset updatedPositioned = Offset( |
| oldConcretePositioned.left ?? 0.0 + 10.0, |
| oldConcretePositioned.top ?? 0.0 + 10.0, |
| ); |
| await tester.dragFrom(centerOfPositioned, dragDistance); |
| await tester.pump(); |
| expect( |
| positionedWidgetInTree, |
| isPositionedAt(updatedPositioned), |
| ); |
| }); |
| |
| testWidgets('should match golden', (WidgetTester tester) async { |
| await tester.pumpWidget(const example.MagnifierExampleApp()); |
| |
| final Offset centerOfPositioned = tester.getCenter(find.byType(Positioned)); |
| const Offset dragDistance = Offset(10, 10); |
| |
| await tester.dragFrom(centerOfPositioned, dragDistance); |
| await tester.pump(); |
| |
| await expectLater( |
| find.byType(RepaintBoundary).last, |
| matchesGoldenFile('magnifier.0_test.png'), |
| ); |
| }); |
| } |