36 lines
1.7 KiB
Dart
36 lines
1.7 KiB
Dart
// Copyright 2014 The Flutter 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 'package:flutter/scheduler.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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test('Can only schedule frames after widget binding attaches the root widget', () async {
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final WidgetsFlutterBindingWithTestBinaryMessenger binding = WidgetsFlutterBindingWithTestBinaryMessenger();
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expect(SchedulerBinding.instance.framesEnabled, isFalse);
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expect(SchedulerBinding.instance.hasScheduledFrame, isFalse);
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// Sends a message to notify that the engine is ready to accept frames.
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final ByteData message = const StringCodec().encodeMessage('AppLifecycleState.resumed')!;
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await binding.defaultBinaryMessenger.handlePlatformMessage('flutter/lifecycle', message, (_) { });
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// Enables the semantics should not schedule any frames if the root widget
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// has not been attached.
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expect(binding.semanticsEnabled, isFalse);
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binding.ensureSemantics();
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expect(binding.semanticsEnabled, isTrue);
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expect(SchedulerBinding.instance.framesEnabled, isFalse);
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expect(SchedulerBinding.instance.hasScheduledFrame, isFalse);
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// The widget binding should be ready to produce frames after it attaches
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// the root widget.
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binding.attachRootWidget(const Placeholder());
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expect(SchedulerBinding.instance.framesEnabled, isTrue);
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expect(SchedulerBinding.instance.hasScheduledFrame, isTrue);
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});
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}
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class WidgetsFlutterBindingWithTestBinaryMessenger extends WidgetsFlutterBinding with TestDefaultBinaryMessengerBinding { }
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