76 lines
2.3 KiB
Dart
76 lines
2.3 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/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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class TestBinding extends LiveTestWidgetsFlutterBinding {
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TestBinding();
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int framesBegun = 0;
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int framesDrawn = 0;
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late bool handleBeginFrameMicrotaskRun;
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@override
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void handleBeginFrame(Duration? rawTimeStamp) {
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handleBeginFrameMicrotaskRun = false;
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framesBegun += 1;
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Future<void>.microtask(() {
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handleBeginFrameMicrotaskRun = true;
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});
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super.handleBeginFrame(rawTimeStamp);
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}
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@override
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void handleDrawFrame() {
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if (!handleBeginFrameMicrotaskRun) {
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throw "Microtasks scheduled by 'handledBeginFrame' must be run before 'handleDrawFrame'.";
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}
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framesDrawn += 1;
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super.handleDrawFrame();
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}
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}
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void main() {
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late TestBinding binding;
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setUp(() {
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binding = TestBinding();
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});
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test('test pumpBenchmark() only runs one frame', () async {
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await benchmarkWidgets(
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(WidgetTester tester) async {
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const root = Key('root');
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binding.attachRootWidget(binding.wrapWithDefaultView(Container(key: root)));
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await tester.pump();
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expect(binding.framesBegun, greaterThan(0));
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expect(binding.framesDrawn, greaterThan(0));
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final Element appState = tester.element(find.byKey(root));
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binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.benchmark;
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final int startFramesBegun = binding.framesBegun;
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final int startFramesDrawn = binding.framesDrawn;
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expect(startFramesBegun, equals(startFramesDrawn));
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appState.markNeedsBuild();
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await tester.pumpBenchmark(const Duration(milliseconds: 16));
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final int endFramesBegun = binding.framesBegun;
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final int endFramesDrawn = binding.framesDrawn;
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expect(endFramesBegun, equals(endFramesDrawn));
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expect(endFramesBegun, equals(startFramesBegun + 1));
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expect(endFramesDrawn, equals(startFramesDrawn + 1));
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},
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// We are not interested in the performance of the "benchmark", we are just
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// testing the behavior. So it's OK that asserts are enabled.
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mayRunWithAsserts: true,
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);
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}, skip: isBrowser); // https://github.com/flutter/flutter/issues/87871
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}
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