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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:ui';
import 'package:flutter/foundation.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
final FlutterMemoryAllocations ma = FlutterMemoryAllocations.instance;
setUp(() {
assert(!ma.hasListeners);
});
testWidgets(
'$FlutterMemoryAllocations is noop when kFlutterMemoryAllocationsEnabled is false.',
(WidgetTester tester) async {
ObjectEvent? receivedEvent;
ObjectEvent listener(ObjectEvent event) => receivedEvent = event;
ma.addListener(listener);
expect(ma.hasListeners, isFalse);
await _activateFlutterObjects(tester);
expect(receivedEvent, isNull);
expect(ma.hasListeners, isFalse);
ma.removeListener(listener);
},
);
}
class _TestRenderObject extends RenderObject {
@override
void debugAssertDoesMeetConstraints() {}
@override
Rect get paintBounds => throw UnimplementedError();
@override
void performLayout() {}
@override
void performResize() {}
@override
Rect get semanticBounds => throw UnimplementedError();
}
class _TestLayer extends Layer{
@override
void addToScene(SceneBuilder builder) {}
}
/// Create and dispose Flutter objects to fire memory allocation events.
Future<void> _activateFlutterObjects(WidgetTester tester) async {
final RenderObject renderObject = _TestRenderObject();
final Layer layer = _TestLayer();
renderObject.dispose();
// It is ok to use protected members for testing.
// ignore: invalid_use_of_protected_member, invalid_use_of_visible_for_testing_member
layer.dispose();
}