35 lines
1.1 KiB
Dart
35 lines
1.1 KiB
Dart
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:typed_data';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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class MemoryPressureObserver extends WidgetsBindingObserver {
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bool sawMemoryPressure = false;
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@override
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void didHaveMemoryPressure() {
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sawMemoryPressure = true;
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}
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}
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void main() {
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setUp(() {
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WidgetsFlutterBinding.ensureInitialized();
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});
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testWidgets('didHaveMemoryPressure callback', (WidgetTester tester) async {
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final MemoryPressureObserver observer = new MemoryPressureObserver();
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WidgetsBinding.instance.addObserver(observer);
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final ByteData message = const JSONMessageCodec().encodeMessage(
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<String, dynamic>{'type': 'memoryPressure'});
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await BinaryMessages.handlePlatformMessage('flutter/system', message, (_) {});
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expect(observer.sawMemoryPressure, true);
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WidgetsBinding.instance.removeObserver(observer);
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});
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}
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