first_frame_test.dart 1.28 KB
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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.

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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  final TestRenderBinding binding = TestRenderBinding();
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  test('Flutter dispatches first frame event on the web only', () async {
    final Completer<void> completer = Completer<void>();
    const MethodChannel firstFrameChannel = MethodChannel('flutter/service_worker');
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    binding.defaultBinaryMessenger.setMockMethodCallHandler(firstFrameChannel, (MethodCall methodCall) async {
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      completer.complete();
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      return null;
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    });

    binding.handleBeginFrame(Duration.zero);
    binding.handleDrawFrame();

    await expectLater(completer.future, completes);
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  }, skip: !kIsWeb); // [intended] the test is only makes sense on the web.
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}

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class TestRenderBinding extends BindingBase
  with SchedulerBinding,
       ServicesBinding,
       GestureBinding,
       SemanticsBinding,
       RendererBinding,
       TestDefaultBinaryMessengerBinding { }