blob: cfe3b7b12a8de730603a08d4036052833d6c1d7c [file] [log] [blame]
// 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:ui' as ui;
import 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
test('PaintingBinding with memory pressure before initInstances', () async {
// Observed in devicelab: the device sends a memory pressure event
// to us before the binding is initialized, so as soon as the
// ServicesBinding's initInstances sets up the callbacks, we get a
// call. Previously this would happen synchronously during
// initInstances (and before the imageCache was initialized, which
// was a problem), but now it happens asynchronously just after.
ui.channelBuffers.push(, SystemChannels.system.codec.encodeMessage(<String, dynamic>{
'type': 'memoryPressure',
}), (ByteData? responseData) {
// The result is: SystemChannels.system.codec.decodeMessage(responseData)
// ...but we ignore it for the purposes of this test.
final TestPaintingBinding binding = TestPaintingBinding();
expect(binding._handled, isFalse);
expect(binding.imageCache, isNotNull);
expect(binding.imageCache.currentSize, 0);
await null; // allow microtasks to run
expect(binding._handled, isTrue);
class TestPaintingBinding extends BindingBase with SchedulerBinding, ServicesBinding, PaintingBinding {
void handleMemoryPressure() {
_handled = true;
bool _handled = false;