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Add test for image.error_builder.0.dart API example. (flutter#148497)
This PR contributes to flutter#130459 ### Description - Adds tests for `examples/api/lib/widgets/image/image.error_builder.0.dart`
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examples/api/test/widgets/image/image.error_builder.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. | ||
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import 'dart:io'; | ||
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import 'package:flutter/material.dart'; | ||
import 'package:flutter_api_samples/widgets/image/image.error_builder.0.dart' | ||
as example; | ||
import 'package:flutter_test/flutter_test.dart'; | ||
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void main() { | ||
// The app being tested loads images via HTTP which the test | ||
// framework defeats by default. | ||
setUpAll(() { | ||
HttpOverrides.global = null; | ||
}); | ||
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testWidgets('Has nonexistent url', (WidgetTester tester) async { | ||
await tester.pumpWidget( | ||
const example.ErrorBuilderExampleApp(), | ||
); | ||
await tester.pumpAndSettle(); | ||
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final Image image = tester.widget<Image>(find.byType(Image)); | ||
final NetworkImage imageProvider = image.image as NetworkImage; | ||
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expect( | ||
imageProvider.url, | ||
equals('https://example.does.not.exist/image.jpg'), | ||
); | ||
}); | ||
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testWidgets('errorBuilder returns text with emoji', (WidgetTester tester) async { | ||
await tester.pumpWidget( | ||
const example.ErrorBuilderExampleApp(), | ||
); | ||
await tester.pumpAndSettle(); | ||
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final Image image = tester.widget<Image>(find.byType(Image)); | ||
final ImageErrorWidgetBuilder errorBuilder = image.errorBuilder!; | ||
final BuildContext context = tester.element(find.byType(Image)); | ||
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expect( | ||
errorBuilder(context, const HttpException('oops'), StackTrace.empty), | ||
isA<Text>().having((Text text) => text.data, 'data', equals('😢')), | ||
); | ||
}); | ||
} |