PowerToys/src/settings-ui/Microsoft.PowerToys.Settings.UI.UnitTests/ViewModelTests/FancyZones.cs

// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Text.Json;
using Microsoft.PowerToys.Settings.UI.Library;
using Microsoft.PowerToys.Settings.UI.Library.ViewModels;
using Microsoft.PowerToys.Settings.UI.UnitTests.BackwardsCompatibility;
using Microsoft.PowerToys.Settings.UI.UnitTests.Mocks;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Moq;

namespace ViewModelTests
{
    [TestClass]
    public class FancyZones
    {
        public const string FancyZonesTestFolderName = "Test\\FancyZones";

        /// <summary>
        /// Test if the original settings files were modified.
        /// </summary>
        [TestMethod]
        [DataRow("v0.18.2", "settings.json")]
        [DataRow("v0.19.2", "settings.json")]
        [DataRow("v0.20.1", "settings.json")]
        [DataRow("v0.21.1", "settings.json")]
        [DataRow("v0.22.0", "settings.json")]
        public void OriginalFilesModificationTest(string version, string fileName)
        {
            var settingPathMock = new Mock<ISettingsPath>();

            var fileMock = BackCompatTestProperties.GetModuleIOProvider(version, FancyZonesSettings.ModuleName, fileName);
            var mockSettingsUtils = new SettingsUtils(fileMock.Object, settingPathMock.Object);
            FancyZonesSettings originalSettings = mockSettingsUtils.GetSettings<FancyZonesSettings>(FancyZonesSettings.ModuleName);

            var mockGeneralIOProvider = BackCompatTestProperties.GetGeneralSettingsIOProvider(version);
            var mockGeneralSettingsUtils = new SettingsUtils(mockGeneralIOProvider.Object, settingPathMock.Object);
            GeneralSettings originalGeneralSettings = mockGeneralSettingsUtils.GetSettings<GeneralSettings>();

            var generalSettingsRepository = new BackCompatTestProperties.MockSettingsRepository<GeneralSettings>(mockGeneralSettingsUtils);
            var fancyZonesRepository = new BackCompatTestProperties.MockSettingsRepository<FancyZonesSettings>(mockSettingsUtils);

            // Initialise View Model with test Config files
            FancyZonesViewModel viewModel = new FancyZonesViewModel(generalSettingsRepository, fancyZonesRepository, ColorPickerIsEnabledByDefault_IPC);

            // Verify that the old settings persisted
            Assert.AreEqual(originalGeneralSettings.Enabled.FancyZones, viewModel.IsEnabled);
            Assert.AreEqual(originalSettings.Properties.FancyzonesAppLastZoneMoveWindows.Value, viewModel.AppLastZoneMoveWindows);
            Assert.AreEqual(originalSettings.Properties.FancyzonesBorderColor.Value, viewModel.ZoneBorderColor);
            Assert.AreEqual(originalSettings.Properties.FancyzonesDisplayChangeMoveWindows.Value, viewModel.DisplayChangeMoveWindows);
            Assert.AreEqual(originalSettings.Properties.FancyzonesEditorHotkey.Value.ToString(), viewModel.EditorHotkey.ToString());
            Assert.AreEqual(originalSettings.Properties.FancyzonesExcludedApps.Value, viewModel.ExcludedApps);
            Assert.AreEqual(originalSettings.Properties.FancyzonesHighlightOpacity.Value, viewModel.HighlightOpacity);
            Assert.AreEqual(originalSettings.Properties.FancyzonesInActiveColor.Value, viewModel.ZoneInActiveColor);
            Assert.AreEqual(originalSettings.Properties.FancyzonesMakeDraggedWindowTransparent.Value, viewModel.MakeDraggedWindowsTransparent);
            Assert.AreEqual(originalSettings.Properties.FancyzonesMouseSwitch.Value, viewModel.MouseSwitch);
            Assert.AreEqual(originalSettings.Properties.FancyzonesMoveWindowsAcrossMonitors.Value, viewModel.MoveWindowsAcrossMonitors);
            Assert.AreEqual(originalSettings.Properties.FancyzonesMoveWindowsBasedOnPosition.Value, viewModel.MoveWindowsBasedOnPosition);
            Assert.AreEqual(originalSettings.Properties.FancyzonesOpenWindowOnActiveMonitor.Value, viewModel.OpenWindowOnActiveMonitor);
            Assert.AreEqual(originalSettings.Properties.FancyzonesOverrideSnapHotkeys.Value, viewModel.OverrideSnapHotkeys);
            Assert.AreEqual(originalSettings.Properties.FancyzonesRestoreSize.Value, viewModel.RestoreSize);
            Assert.AreEqual(originalSettings.Properties.FancyzonesShiftDrag.Value, viewModel.ShiftDrag);
            Assert.AreEqual(originalSettings.Properties.FancyzonesShowOnAllMonitors.Value, viewModel.ShowOnAllMonitors);
            Assert.AreEqual(originalSettings.Properties.FancyzonesSpanZonesAcrossMonitors.Value, viewModel.SpanZonesAcrossMonitors);
            Assert.AreEqual(originalSettings.Properties.FancyzonesZoneHighlightColor.Value, viewModel.ZoneHighlightColor);
            Assert.AreEqual(originalSettings.Properties.FancyzonesZoneSetChangeMoveWindows.Value, viewModel.ZoneSetChangeMoveWindows);
            Assert.AreEqual(originalSettings.Properties.UseCursorposEditorStartupscreen.Value, viewModel.UseCursorPosEditorStartupScreen);

            // Verify that the stub file was used
            var expectedCallCount = 2;  // once via the view model, and once by the test (GetSettings<T>)
            BackCompatTestProperties.VerifyModuleIOProviderWasRead(fileMock, FancyZonesSettings.ModuleName, expectedCallCount);
            BackCompatTestProperties.VerifyGeneralSettingsIOProviderWasRead(mockGeneralIOProvider, expectedCallCount);
        }

        private int ColorPickerIsEnabledByDefault_IPC(string msg)
        {
            OutGoingGeneralSettings snd = JsonSerializer.Deserialize<OutGoingGeneralSettings>(msg);
            Assert.IsTrue(snd.GeneralSettings.Enabled.ColorPicker);
            return 0;
        }

        private Mock<ISettingsUtils> mockGeneralSettingsUtils;

        private Mock<ISettingsUtils> mockFancyZonesSettingsUtils;

        [TestInitialize]
        public void SetUpStubSettingUtils()
        {
            mockGeneralSettingsUtils = ISettingsUtilsMocks.GetStubSettingsUtils<GeneralSettings>();
            mockFancyZonesSettingsUtils = ISettingsUtilsMocks.GetStubSettingsUtils<FancyZonesSettings>();
        }

        [TestMethod]
        public void IsEnabledShouldDisableModuleWhenSuccessful()
        {
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                OutGoingGeneralSettings snd = JsonSerializer.Deserialize<OutGoingGeneralSettings>(msg);
                Assert.IsFalse(snd.GeneralSettings.Enabled.FancyZones);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsTrue(viewModel.IsEnabled); // check if the module is enabled.

            // act
            viewModel.IsEnabled = false;
        }

        [TestMethod]
        public void ShiftDragShouldSetValue2FalseWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsFalse(snd.Powertoys.FancyZones.Properties.FancyzonesShiftDrag.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsTrue(viewModel.ShiftDrag); // check if value was initialized to false.

            // act
            viewModel.ShiftDrag = false;
        }

        [TestMethod]
        public void OverrideSnapHotkeysShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesOverrideSnapHotkeys.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.OverrideSnapHotkeys); // check if value was initialized to false.

            // act
            viewModel.OverrideSnapHotkeys = true;
        }

        [TestMethod]
        public void MoveWindowsBasedOnPositionShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesMoveWindowsBasedOnPosition.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.MoveWindowsBasedOnPosition); // check if value was initialized to false.

            // act
            viewModel.MoveWindowsBasedOnPosition = true;
        }

        [TestMethod]
        public void ZoneSetChangeFlashZonesShouldSetValue2FalseWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesMakeDraggedWindowTransparent.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.MakeDraggedWindowsTransparent); // check if value was initialized to false.

            // act
            viewModel.MakeDraggedWindowsTransparent = true;
        }

        [TestMethod]
        public void MouseSwitchShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesMouseSwitch.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.MouseSwitch); // check if value was initialized to false.

            // act
            viewModel.MouseSwitch = true;
        }

        [TestMethod]
        public void DisplayChangeMoveWindowsShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesDisplayChangeMoveWindows.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.DisplayChangeMoveWindows); // check if value was initialized to false.

            // act
            viewModel.DisplayChangeMoveWindows = true;
        }

        [TestMethod]
        public void ZoneSetChangeMoveWindowsShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesZoneSetChangeMoveWindows.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.ZoneSetChangeMoveWindows); // check if value was initialized to false.

            // act
            viewModel.ZoneSetChangeMoveWindows = true;
        }

        [TestMethod]
        public void AppLastZoneMoveWindowsShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesAppLastZoneMoveWindows.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.AppLastZoneMoveWindows); // check if value was initialized to false.

            // act
            viewModel.AppLastZoneMoveWindows = true;
        }

        public void OpenWindowOnActiveMonitorShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesOpenWindowOnActiveMonitor.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.OpenWindowOnActiveMonitor); // check if value was initialized to false.

            // act
            viewModel.OpenWindowOnActiveMonitor = true;
        }

        [TestMethod]
        public void RestoreSizeShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesRestoreSize.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.RestoreSize); // check if value was initialized to false.

            // act
            viewModel.RestoreSize = true;
        }

        [TestMethod]
        public void UseCursorPosEditorStartupScreenShouldSetValue2FalseWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.UseCursorposEditorStartupscreen.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsTrue(viewModel.UseCursorPosEditorStartupScreen); // check if value was initialized to false.

            // act
            viewModel.UseCursorPosEditorStartupScreen = true;
        }

        [TestMethod]
        public void ShowOnAllMonitorsShouldSetValue2TrueWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.IsTrue(snd.Powertoys.FancyZones.Properties.FancyzonesShowOnAllMonitors.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.IsFalse(viewModel.ShowOnAllMonitors); // check if value was initialized to false.

            // act
            viewModel.ShowOnAllMonitors = true;
        }

        [TestMethod]
        public void ZoneHighlightColorShouldSetColorValue2WhiteWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.AreEqual("#FFFFFF", snd.Powertoys.FancyZones.Properties.FancyzonesZoneHighlightColor.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.AreEqual(ConfigDefaults.DefaultFancyZonesZoneHighlightColor, viewModel.ZoneHighlightColor);

            // act
            viewModel.ZoneHighlightColor = "#FFFFFF";
        }

        [TestMethod]
        public void ZoneBorderColorShouldSetColorValue2WhiteWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.AreEqual("#FFFFFF", snd.Powertoys.FancyZones.Properties.FancyzonesBorderColor.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.AreEqual(ConfigDefaults.DefaultFancyzonesBorderColor, viewModel.ZoneBorderColor);

            // act
            viewModel.ZoneBorderColor = "#FFFFFF";
        }

        [TestMethod]
        public void ZoneInActiveColorShouldSetColorValue2WhiteWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.AreEqual("#FFFFFF", snd.Powertoys.FancyZones.Properties.FancyzonesInActiveColor.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.AreEqual(ConfigDefaults.DefaultFancyZonesInActiveColor, viewModel.ZoneInActiveColor);

            // act
            viewModel.ZoneInActiveColor = "#FFFFFF";
        }

        [TestMethod]
        public void ExcludedAppsShouldSetColorValue2WhiteWhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.AreEqual("Sample", snd.Powertoys.FancyZones.Properties.FancyzonesExcludedApps.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.AreEqual(string.Empty, viewModel.ExcludedApps);

            // act
            viewModel.ExcludedApps = "Sample";
        }

        [TestMethod]
        public void HighlightOpacityShouldSetOpacityValueTo60WhenSuccessful()
        {
            // Assert
            Func<string, int> sendMockIPCConfigMSG = msg =>
            {
                FancyZonesSettingsIPCMessage snd = JsonSerializer.Deserialize<FancyZonesSettingsIPCMessage>(msg);
                Assert.AreEqual(60, snd.Powertoys.FancyZones.Properties.FancyzonesHighlightOpacity.Value);
                return 0;
            };

            // arrange
            FancyZonesViewModel viewModel = new FancyZonesViewModel(SettingsRepository<GeneralSettings>.GetInstance(mockGeneralSettingsUtils.Object), SettingsRepository<FancyZonesSettings>.GetInstance(mockFancyZonesSettingsUtils.Object), sendMockIPCConfigMSG, FancyZonesTestFolderName);
            Assert.AreEqual(50, viewModel.HighlightOpacity);

            // act
            viewModel.HighlightOpacity = 60;
        }
    }
}