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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.
// @dart = 2.8
import 'dart:async';
import 'dart:convert';
import 'dart:typed_data';
import 'package:flutter/foundation.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
class TestAssetBundle extends CachingAssetBundle {
TestAssetBundle(this._assetBundleMap);
final Map<String, List<String>> _assetBundleMap;
Map<String, int> loadCallCount = <String, int>{};
String get _assetBundleContents {
return json.encode(_assetBundleMap);
}
@override
Future<ByteData> load(String key) async {
if (key == 'AssetManifest.json')
return ByteData.view(Uint8List.fromList(
const Utf8Encoder().convert(_assetBundleContents)).buffer);
loadCallCount[key] = loadCallCount[key] ?? 0 + 1;
if (key == 'one')
return ByteData(1)
..setInt8(0, 49);
throw FlutterError('key not found');
}
}
void main() {
group('1.0 scale device tests', () {
void _buildAndTestWithOneAsset(String mainAssetPath) {
final Map<String, List<String>> assetBundleMap = <String, List<String>>{};
assetBundleMap[mainAssetPath] = <String>[];
final AssetImage assetImage = AssetImage(
mainAssetPath,
bundle: TestAssetBundle(assetBundleMap));
const ImageConfiguration configuration = ImageConfiguration();
assetImage.obtainKey(configuration)
.then(expectAsync1((AssetBundleImageKey bundleKey) {
expect(bundleKey.name, mainAssetPath);
expect(bundleKey.scale, 1.0);
}));
}
test('When asset is main variant check scale is 1.0', () {
_buildAndTestWithOneAsset('assets/normalFolder/normalFile.png');
});
test('When asset path and key are the same string even though it could be took as a 3.0x variant', () async {
_buildAndTestWithOneAsset('assets/parentFolder/3.0x/normalFile.png');
});
test('When asset path contains variant identifier as part of parent folder name scale is 1.0', () {
_buildAndTestWithOneAsset('assets/parentFolder/__3.0x__/leafFolder/normalFile.png');
});
test('When asset path contains variant identifier as part of leaf folder name scale is 1.0', () {
_buildAndTestWithOneAsset('assets/parentFolder/__3.0x_leaf_folder_/normalFile.png');
});
test('When asset path contains variant identifier as part of parent folder name scale is 1.0', () {
_buildAndTestWithOneAsset('assets/parentFolder/__3.0x__/leafFolder/normalFile.png');
});
test('When asset path contains variant identifier in parent folder scale is 1.0', () {
_buildAndTestWithOneAsset('assets/parentFolder/3.0x/leafFolder/normalFile.png');
});
});
group('High-res device behavior tests', () {
test('When asset is not main variant check scale is not 1.0', () {
const String mainAssetPath = 'assets/normalFolder/normalFile.png';
const String variantPath = 'assets/normalFolder/3.0x/normalFile.png';
final Map<String, List<String>> assetBundleMap =
<String, List<String>>{};
assetBundleMap[mainAssetPath] = <String>[mainAssetPath, variantPath];
final TestAssetBundle testAssetBundle = TestAssetBundle(
assetBundleMap);
final AssetImage assetImage = AssetImage(
mainAssetPath,
bundle: testAssetBundle);
// we have the exact match for this scale, let's use it
assetImage.obtainKey(const ImageConfiguration())
.then(expectAsync1((AssetBundleImageKey bundleKey) {
expect(bundleKey.name, mainAssetPath);
expect(bundleKey.scale, 1.0);
}));
// we also have the exact match for this scale, let's use it
assetImage.obtainKey(ImageConfiguration(
bundle: testAssetBundle,
devicePixelRatio: 3.0,
)).then(expectAsync1((AssetBundleImageKey bundleKey) {
expect(bundleKey.name, variantPath);
expect(bundleKey.scale, 3.0);
}));
});
test('When high-res device and high-res asset not present in bundle then return main variant', () {
const String mainAssetPath = 'assets/normalFolder/normalFile.png';
final Map<String, List<String>> assetBundleMap =
<String, List<String>>{};
assetBundleMap[mainAssetPath] = <String>[mainAssetPath];
final TestAssetBundle testAssetBundle = TestAssetBundle(
assetBundleMap);
final AssetImage assetImage = AssetImage(
mainAssetPath,
bundle: TestAssetBundle(assetBundleMap));
assetImage.obtainKey(const ImageConfiguration())
.then(expectAsync1((AssetBundleImageKey bundleKey) {
expect(bundleKey.name, mainAssetPath);
expect(bundleKey.scale, 1.0);
}));
assetImage.obtainKey(ImageConfiguration(
bundle: testAssetBundle,
devicePixelRatio: 3.0),
).then(expectAsync1((AssetBundleImageKey bundleKey) {
expect(bundleKey.name, mainAssetPath);
expect(bundleKey.scale, 1.0);
}));
});
});
group('Regression - When assets available are 1.0 and 3.0 check devices with a range of scales', () {
const String mainAssetPath = 'assets/normalFolder/normalFile.png';
const String variantPath = 'assets/normalFolder/3.0x/normalFile.png';
void _buildBundleAndTestVariantLogic(
double deviceRatio,
double chosenAssetRatio,
String expectedAssetPath,
) {
final Map<String, List<String>> assetBundleMap =
<String, List<String>>{};
assetBundleMap[mainAssetPath] = <String>[mainAssetPath, variantPath];
final TestAssetBundle testAssetBundle = TestAssetBundle(
assetBundleMap);
final AssetImage assetImage = AssetImage(
mainAssetPath,
bundle: testAssetBundle);
// we have 1.0 and 3.0, asking for 1.5 should give
assetImage.obtainKey(ImageConfiguration(
bundle: testAssetBundle,
devicePixelRatio: deviceRatio),
).then(expectAsync1((AssetBundleImageKey bundleKey) {
expect(bundleKey.name, expectedAssetPath);
expect(bundleKey.scale, chosenAssetRatio);
}));
}
test('Obvious case 1.0 - we have exact asset', () {
_buildBundleAndTestVariantLogic(1.0, 1.0, mainAssetPath);
});
test('Obvious case 3.0 - we have exact asset', () {
_buildBundleAndTestVariantLogic(3.0, 3.0, variantPath);
});
test('Typical case 2.0', () {
_buildBundleAndTestVariantLogic(2.0, 1.0, mainAssetPath);
});
test('Borderline case 2.01', () {
_buildBundleAndTestVariantLogic(2.01, 3.0, variantPath);
});
test('Borderline case 2.9', () {
_buildBundleAndTestVariantLogic(2.9, 3.0, variantPath);
});
test('Typical case 4.0', () {
_buildBundleAndTestVariantLogic(4.0, 3.0, variantPath);
});
});
}