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39 lines
1.5 KiB
Dart
39 lines
1.5 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/rendering.dart';
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import 'package:flutter/scheduler.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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WidgetsFlutterBinding.ensureInitialized();
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test('handleMetricsChanged does not scheduleForcedFrame unless there is a child to the renderView', () async {
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expect(SchedulerBinding.instance.hasScheduledFrame, false);
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RendererBinding.instance.handleMetricsChanged();
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expect(SchedulerBinding.instance.hasScheduledFrame, false);
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RendererBinding.instance.renderView.child = RenderLimitedBox();
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RendererBinding.instance.handleMetricsChanged();
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expect(SchedulerBinding.instance.hasScheduledFrame, true);
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});
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test('debugDumpSemantics prints explanation when semantics are unavailable', () {
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final List<String?> log = <String?>[];
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debugPrint = (String? message, {int? wrapWidth}) {
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log.add(message);
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};
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debugDumpSemanticsTree();
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expect(log, hasLength(1));
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expect(
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log.single,
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'Semantics not generated.\n'
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'For performance reasons, the framework only generates semantics when asked to do so by the platform.\n'
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'Usually, platforms only ask for semantics when assistive technologies (like screen readers) are running.\n'
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'To generate semantics, try turning on an assistive technology (like VoiceOver or TalkBack) on your device.'
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);
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});
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}
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