image_cache_resize_test.dart

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

import '../rendering/rendering_tester.dart';
import 'mocks_for_image_cache.dart';

void main() {
  TestRenderingFlutterBinding(); // initializes the imageCache
  group(ImageCache, () {
    tearDown(() {
      imageCache.clear();
      imageCache.maximumSize = 1000;
      imageCache.maximumSizeBytes = 10485760;
    });

    test('Image cache resizing based on count', () async {
      imageCache.maximumSize = 2;

      final TestImageInfo a = await extractOneFrame(const TestImageProvider(1, 1).resolve(ImageConfiguration.empty)) as TestImageInfo;
      final TestImageInfo b = await extractOneFrame(const TestImageProvider(2, 2).resolve(ImageConfiguration.empty)) as TestImageInfo;
      final TestImageInfo c = await extractOneFrame(const TestImageProvider(3, 3).resolve(ImageConfiguration.empty)) as TestImageInfo;
      final TestImageInfo d = await extractOneFrame(const TestImageProvider(1, 4).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(a.value, equals(1));
      expect(b.value, equals(2));
      expect(c.value, equals(3));
      expect(d.value, equals(4));

      imageCache.maximumSize = 0;

      final TestImageInfo e = await extractOneFrame(const TestImageProvider(1, 5).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(e.value, equals(5));

      final TestImageInfo f = await extractOneFrame(const TestImageProvider(1, 6).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(f.value, equals(6));

      imageCache.maximumSize = 3;

      final TestImageInfo g = await extractOneFrame(const TestImageProvider(1, 7).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(g.value, equals(7));

      final TestImageInfo h = await extractOneFrame(const TestImageProvider(1, 8).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(h.value, equals(7));
    });

    test('Image cache resizing based on size', () async {
      const TestImage testImage = TestImage(width: 8, height: 8); // 256 B.
      imageCache.maximumSizeBytes = 256 * 2;

      final TestImageInfo a = await extractOneFrame(const TestImageProvider(1, 1, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      final TestImageInfo b = await extractOneFrame(const TestImageProvider(2, 2, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      final TestImageInfo c = await extractOneFrame(const TestImageProvider(3, 3, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      final TestImageInfo d = await extractOneFrame(const TestImageProvider(1, 4, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(a.value, equals(1));
      expect(b.value, equals(2));
      expect(c.value, equals(3));
      expect(d.value, equals(4));

      imageCache.maximumSizeBytes = 0;

      final TestImageInfo e = await extractOneFrame(const TestImageProvider(1, 5, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(e.value, equals(5));

      final TestImageInfo f = await extractOneFrame(const TestImageProvider(1, 6, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(f.value, equals(6));

      imageCache.maximumSizeBytes = 256 * 3;

      final TestImageInfo g = await extractOneFrame(const TestImageProvider(1, 7, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(g.value, equals(7));

      final TestImageInfo h = await extractOneFrame(const TestImageProvider(1, 8, image: testImage).resolve(ImageConfiguration.empty)) as TestImageInfo;
      expect(h.value, equals(7));
    });
  });
}