packages/flutter_tools/test/general.shard/asset_bundle_variant_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 'dart:convert';

import 'package:file/file.dart';
import 'package:file/memory.dart';

import 'package:flutter_tools/src/asset.dart';
import 'package:flutter_tools/src/base/file_system.dart';

import 'package:flutter_tools/src/globals.dart' as globals;

import '../src/common.dart';
import '../src/context.dart';

void main() {
  String fixPath(String path) {
    // The in-memory file system is strict about slashes on Windows being the
    // correct way so until https://github.com/google/file.dart/issues/112 is
    // fixed we fix them here.
    // TODO(dantup): Remove this function once the above issue is fixed and
    // rolls into Flutter.
    return path.replaceAll('/', globals.fs.path.separator);
  }

  group('AssetBundle asset variants', () {
    late FileSystem testFileSystem;
    setUp(() async {
      testFileSystem = MemoryFileSystem(
        style: globals.platform.isWindows
          ? FileSystemStyle.windows
          : FileSystemStyle.posix,
      );
      testFileSystem.currentDirectory = testFileSystem.systemTempDirectory.createTempSync('flutter_asset_bundle_variant_test.');
    });

    testUsingContext('main asset and variants', () async {
      globals.fs.file('pubspec.yaml')
        ..createSync()
        ..writeAsStringSync(
'''
name: test
dependencies:
  flutter:
    sdk: flutter
flutter:
  assets:
    - a/b/c/foo
'''
      );
      globals.fs.file('.packages').createSync();

      final List<String> assets = <String>[
        'a/b/c/foo',
        'a/b/c/var1/foo',
        'a/b/c/var2/foo',
        'a/b/c/var3/foo',
      ];
      for (final String asset in assets) {
        globals.fs.file(fixPath(asset))
          ..createSync(recursive: true)
          ..writeAsStringSync(asset);
      }

      AssetBundle bundle = AssetBundleFactory.instance.createBundle();
      await bundle.build(packagesPath: '.packages');

      // The main asset file, /a/b/c/foo, and its variants exist.
      for (final String asset in assets) {
        expect(bundle.entries.containsKey(asset), true);
        expect(utf8.decode(await bundle.entries[asset]!.contentsAsBytes()), asset);
      }

      globals.fs.file(fixPath('a/b/c/foo')).deleteSync();
      bundle = AssetBundleFactory.instance.createBundle();
      await bundle.build(packagesPath: '.packages');

      // Now the main asset file, /a/b/c/foo, does not exist. This is OK because
      // the /a/b/c/*/foo variants do exist.
      expect(bundle.entries.containsKey('a/b/c/foo'), false);
      for (final String asset in assets.skip(1)) {
        expect(bundle.entries.containsKey(asset), true);
        expect(utf8.decode(await bundle.entries[asset]!.contentsAsBytes()), asset);
      }
    }, overrides: <Type, Generator>{
      FileSystem: () => testFileSystem,
      ProcessManager: () => FakeProcessManager.any(),
    });
  });
}