flutter/packages/flutter_tools/test/build_system/targets/assets_test.dart

// Copyright 2019 The Chromium 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_tools/src/base/file_system.dart';
import 'package:flutter_tools/src/build_system/build_system.dart';
import 'package:flutter_tools/src/build_system/targets/assets.dart';

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

void main() {
  group('copy_assets', () {
    Testbed testbed;
    BuildSystem buildSystem;
    Environment environment;

    setUp(() {
      testbed = Testbed(setup: () {
        environment = Environment(
          projectDir: fs.currentDirectory,
        );
        buildSystem = BuildSystem(<String, Target>{
          copyAssets.name: copyAssets,
        });
        fs.file(fs.path.join('assets', 'foo', 'bar.png'))
          ..createSync(recursive: true);
        fs.file('.packages')
          ..createSync();
        fs.file('pubspec.yaml')
          ..createSync()
          ..writeAsStringSync('''
name: example

flutter:
  assets:
    - assets/foo/bar.png
''');
      });
    });

    test('Copies files to correct asset directory', () => testbed.run(() async {
      await buildSystem.build('copy_assets', environment, const BuildSystemConfig());

      expect(fs.file(fs.path.join(environment.buildDir.path, 'flutter_assets', 'AssetManifest.json')).existsSync(), true);
      expect(fs.file(fs.path.join(environment.buildDir.path, 'flutter_assets', 'FontManifest.json')).existsSync(), true);
      expect(fs.file(fs.path.join(environment.buildDir.path, 'flutter_assets', 'LICENSE')).existsSync(), true);
      // See https://github.com/flutter/flutter/issues/35293
      expect(fs.file(fs.path.join(environment.buildDir.path, 'flutter_assets', 'assets/foo/bar.png')).existsSync(), true);
    }));

    test('Does not leave stale files in build directory', () => testbed.run(() async {
      await buildSystem.build('copy_assets', environment, const BuildSystemConfig());

      expect(fs.file(fs.path.join(environment.buildDir.path, 'flutter_assets', 'assets/foo/bar.png')).existsSync(), true);
      // Modify manifest to remove asset.
      fs.file('pubspec.yaml')
        ..createSync()
        ..writeAsStringSync('''
name: example

flutter:
''');
      await buildSystem.build('copy_assets', environment, const BuildSystemConfig());

      // See https://github.com/flutter/flutter/issues/35293
      expect(fs.file(fs.path.join(environment.buildDir.path, 'flutter_assets', 'assets/foo/bar.png')).existsSync(), false);
    }));
  });
}