packages/flutter_tools/test/utils_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/utils.dart';
import 'package:test/test.dart';

void main() {
  group('SettingsFile', () {
    test('parse', () {
      SettingsFile file = new SettingsFile.parse('''
# ignore comment
foo=bar
baz=qux
''');
      expect(file.values['foo'], 'bar');
      expect(file.values['baz'], 'qux');
      expect(file.values, hasLength(2));
    });
  });

  group('uuid', () {
    // xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
    test('simple', () {
      Uuid uuid = new Uuid();
      String result = uuid.generateV4();
      expect(result.length, 36);
      expect(result[8], '-');
      expect(result[13], '-');
      expect(result[18], '-');
      expect(result[23], '-');
    });

    test('can parse', () {
      Uuid uuid = new Uuid();
      String result = uuid.generateV4();
      expect(int.parse(result.substring(0, 8), radix: 16), isNotNull);
      expect(int.parse(result.substring(9, 13), radix: 16), isNotNull);
      expect(int.parse(result.substring(14, 18), radix: 16), isNotNull);
      expect(int.parse(result.substring(19, 23), radix: 16), isNotNull);
      expect(int.parse(result.substring(24, 36), radix: 16), isNotNull);
    });

    test('special bits', () {
      Uuid uuid = new Uuid();
      String result = uuid.generateV4();
      expect(result[14], '4');
      expect(result[19].toLowerCase(), isIn('89ab'));

      result = uuid.generateV4();
      expect(result[19].toLowerCase(), isIn('89ab'));

      result = uuid.generateV4();
      expect(result[19].toLowerCase(), isIn('89ab'));
    });

    test('is pretty random', () {
      Set<String> set = new Set<String>();

      Uuid uuid = new Uuid();
      for (int i = 0; i < 64; i++) {
        String val = uuid.generateV4();
        expect(set, isNot(contains(val)));
        set.add(val);
      }

      uuid = new Uuid();
      for (int i = 0; i < 64; i++) {
        String val = uuid.generateV4();
        expect(set, isNot(contains(val)));
        set.add(val);
      }

      uuid = new Uuid();
      for (int i = 0; i < 64; i++) {
        String val = uuid.generateV4();
        expect(set, isNot(contains(val)));
        set.add(val);
      }
    });
  });
}