packages/devtools_app/test/preferences_controller_test.dart

// Copyright 2020 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:devtools_app/src/preferences.dart';
import 'package:test/test.dart';

void main() {
  group('PreferencesController', () {
    PreferencesController controller;

    setUp(() {
      controller = PreferencesController();
    });

    test('has value', () {
      expect(controller.darkModeTheme.value, isNotNull);
    });

    test('toggleDarkModeTheme', () {
      bool valueChanged = false;
      final originalValue = controller.darkModeTheme.value;

      controller.darkModeTheme.addListener(() {
        valueChanged = true;
      });

      controller.toggleDarkModeTheme(!controller.darkModeTheme.value);
      expect(valueChanged, isTrue);
      expect(controller.darkModeTheme.value, isNot(originalValue));
    });
  });
}