image_cache_tracing_test.dart 3.04 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:convert';

import 'package:flutter/painting.dart';
import 'package:flutter_test/flutter_test.dart';

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import 'common.dart';
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void main() {
  initTimelineTests();
  TestWidgetsFlutterBinding.ensureInitialized();
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  test('Image cache tracing', () async {
    final TestImageStreamCompleter completer1 = TestImageStreamCompleter();
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    final TestImageStreamCompleter completer2 = TestImageStreamCompleter();
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    PaintingBinding.instance.imageCache.putIfAbsent(
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      'Test',
      () => completer1,
    );
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    PaintingBinding.instance.imageCache.clear();
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    completer2.testSetImage(ImageInfo(image: await createTestImage()));
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    PaintingBinding.instance.imageCache.putIfAbsent(
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      'Test2',
      () => completer2,
    );
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    PaintingBinding.instance.imageCache.evict('Test2');
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    _expectTimelineEvents(
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      await fetchTimelineEvents(),
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      <Map<String, dynamic>>[
        <String, dynamic>{
          'name': 'ImageCache.putIfAbsent',
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          'args': <String, dynamic>{'key': 'Test', 'isolateId': isolateId},
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        },
        <String, dynamic>{
          'name': 'listener',
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          'args': <String, dynamic>{'isolateId': isolateId},
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        },
        <String, dynamic>{
          'name': 'ImageCache.clear',
          'args': <String, dynamic>{
            'pendingImages': 1,
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            'keepAliveImages': 0,
            'liveImages': 1,
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            'currentSizeInBytes': 0,
            'isolateId': isolateId,
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          },
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        },
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        <String, dynamic>{
          'name': 'ImageCache.putIfAbsent',
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          'args': <String, dynamic>{'key': 'Test2', 'isolateId': isolateId},
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        },
        <String, dynamic>{
          'name': 'ImageCache.evict',
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          'args': <String, dynamic>{'sizeInBytes': 4, 'isolateId': isolateId},
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        },
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      ],
    );
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  }, skip: isBrowser); // [intended] uses dart:isolate and io.
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}

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void _expectTimelineEvents(List<TimelineEvent> events, List<Map<String, dynamic>> expected) {
  for (final TimelineEvent event in events) {
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    for (int index = 0; index < expected.length; index += 1) {
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      if (expected[index]['name'] == event.json!['name']) {
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        final Map<String, dynamic> expectedArgs = expected[index]['args'] as Map<String, dynamic>;
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        final Map<String, dynamic> args = event.json!['args'] as Map<String, dynamic>;
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        if (_mapsEqual(expectedArgs, args)) {
          expected.removeAt(index);
        }
      }
    }
  }
  if (expected.isNotEmpty) {
    final String encodedEvents = jsonEncode(events);
    fail('Timeline did not contain expected events: $expected\nactual: $encodedEvents');
  }
}

bool _mapsEqual(Map<String, dynamic> expectedArgs, Map<String, dynamic> args) {
  for (final String key in expectedArgs.keys) {
    if (expectedArgs[key] != args[key]) {
      return false;
    }
  }
  return true;
}

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class TestImageStreamCompleter extends ImageStreamCompleter {
  void testSetImage(ImageInfo image) {
    setImage(image);
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  }
}