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Add test for draggable.0.dart API example. (#147941)
This PR contributes to #130459 ### Description - Adds test for `examples/api/lib/widgets/drag_target/draggable.0.dart`
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examples/api/test/widgets/drag_target/draggable.0_test.dart
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// 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/drag_target/draggable.0.dart' | ||
as example; | ||
import 'package:flutter_test/flutter_test.dart'; | ||
|
||
void main() { | ||
Finder findContainerWith({ | ||
required Finder child, | ||
required Color color, | ||
}) { | ||
return find.ancestor( | ||
of: child, | ||
matching: find.byWidgetPredicate( | ||
(Widget widget) => widget is Container && widget.color == color, | ||
), | ||
); | ||
} | ||
|
||
testWidgets('Verify initial state', (WidgetTester tester) async { | ||
await tester.pumpWidget( | ||
const example.DraggableExampleApp(), | ||
); | ||
|
||
expect(find.text('Draggable Sample'), findsOneWidget); | ||
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||
expect( | ||
findContainerWith( | ||
color: Colors.lightGreenAccent, | ||
child: find.text('Draggable'), | ||
), | ||
findsOneWidget, | ||
); | ||
|
||
expect( | ||
findContainerWith( | ||
color: Colors.cyan, | ||
child: find.text('Value is updated to: 0'), | ||
), | ||
findsOneWidget, | ||
); | ||
}); | ||
|
||
testWidgets('Verify correct containers are displayed while dragging', (WidgetTester tester) async { | ||
await tester.pumpWidget( | ||
const example.DraggableExampleApp(), | ||
); | ||
|
||
final Finder idleContainer = findContainerWith( | ||
color: Colors.lightGreenAccent, | ||
child: find.text('Draggable'), | ||
); | ||
final Finder draggingContainer = findContainerWith( | ||
color: Colors.pinkAccent, | ||
child: find.text('Child When Dragging'), | ||
); | ||
final Finder feedbackContainer = findContainerWith( | ||
color: Colors.deepOrange, | ||
child: find.byIcon(Icons.directions_run), | ||
); | ||
|
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expect(idleContainer, findsOneWidget); | ||
expect(draggingContainer, findsNothing); | ||
expect(feedbackContainer, findsNothing); | ||
|
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final TestGesture gesture = await tester.startGesture( | ||
tester.getCenter(idleContainer), | ||
); | ||
await tester.pump(); | ||
|
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expect(idleContainer, findsNothing); | ||
expect(draggingContainer, findsOneWidget); | ||
expect(feedbackContainer, findsOneWidget); | ||
|
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await gesture.moveBy(const Offset(200, 0)); | ||
await tester.pump(); | ||
|
||
expect(idleContainer, findsNothing); | ||
expect(draggingContainer, findsOneWidget); | ||
expect(feedbackContainer, findsOneWidget); | ||
|
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await gesture.up(); | ||
await tester.pump(); | ||
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expect(idleContainer, findsOneWidget); | ||
expect(draggingContainer, findsNothing); | ||
expect(feedbackContainer, findsNothing); | ||
}); | ||
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testWidgets('Dropping Draggable over DragTarget updates the counter', (WidgetTester tester) async { | ||
await tester.pumpWidget( | ||
const example.DraggableExampleApp(), | ||
); | ||
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final Finder draggable = find.byType(Draggable<int>); | ||
final Finder target = find.byType(DragTarget<int>); | ||
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int counter = 0; | ||
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for (int i = 0; i < 5; i++) { | ||
final TestGesture gesture = await tester.startGesture( | ||
tester.getCenter(draggable), | ||
); | ||
await gesture.moveTo(tester.getCenter(target)); | ||
await gesture.up(); | ||
await tester.pump(); | ||
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counter += 10; | ||
|
||
expect( | ||
findContainerWith( | ||
color: Colors.cyan, | ||
child: find.text('Value is updated to: $counter'), | ||
), | ||
findsOneWidget, | ||
); | ||
} | ||
}); | ||
} |