flutter/packages/flutter_tools/test/forbid_package_path_test.dart

// Copyright 2016 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/base/platform.dart';
import 'package:test/test.dart';

void main() {
  setUp(() {
    String flutterTools = fs.path.join(platform.environment['FLUTTER_ROOT'],
        'packages', 'flutter_tools');
    assert(fs.path.equals(fs.currentDirectory.path, flutterTools));
  });

  test('no unauthorized imports of package:path', () {
    for (String path in <String>['lib', 'bin', 'test']) {
      fs.directory(path)
        .listSync(recursive: true)
        .where(_isDartFile)
        .map(_asFile)
        .forEach((File file) {
          for (String line in file.readAsLinesSync()) {
            if (line.startsWith(new RegExp('import.*package:path/path.dart'))) {
              fail("${file.path} imports 'package:path/path.dart'; use 'fs.path' instead");
            }
          }
        }
      );
    }
  });
}

bool _isDartFile(FileSystemEntity entity) => entity is File && entity.path.endsWith('.dart');

File _asFile(FileSystemEntity entity) => entity;