src/settings-ui/Settings.UI.UnitTests/ViewModelTests/ShellViewModelTests.cs - main - githubmirror/PowerToys

src/settings-ui/Settings.UI.UnitTests/ViewModelTests/ShellViewModelTests.cs

62 строки2 KB

Clint Rutkas

[Settings] Extract HandleNavigationFailure and test all null permutations (#48410)

24 июн 2026, 11:02

24 июн 2026, 11:024733514

// 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 Microsoft.PowerToys.Settings.UI.ViewModels;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace ViewModelTests
{
    [TestClass]
    public class ShellViewModelTests
    {
        [TestMethod]
        public void GetPageDisplayName_ReturnsFullName_ForKnownType()
        {
            string actual = ShellViewModel.GetPageDisplayName(typeof(ShellViewModelTests));

            Assert.AreEqual(typeof(ShellViewModelTests).FullName, actual);
        }

        [TestMethod]
        public void GetPageDisplayName_ReturnsPlaceholder_ForNullType()
        {
            // NavigationFailedEventArgs.SourcePageType can be null when navigation fails
            // before the runtime can resolve the requested page type. The handler must
            // tolerate this without throwing NullReferenceException.
            string actual = ShellViewModel.GetPageDisplayName(null);

            Assert.AreEqual("<unknown>", actual);
        }

        [TestMethod]
        public void HandleNavigationFailure_DoesNotThrow_ForNullInputs()
        {
            // Frame_NavigationFailed must never throw - re-throwing back into the
            // WinUI dispatcher tears the process down via RoFailFastWithErrorContextInternal2.
            // Both SourcePageType and Exception can legitimately be null on a failed
            // Frame.Navigate, so the failure-handling path must tolerate that.
            ShellViewModel.HandleNavigationFailure(null, null);
        }

        [TestMethod]
        public void HandleNavigationFailure_DoesNotThrow_ForNullException()
        {
            ShellViewModel.HandleNavigationFailure(typeof(ShellViewModelTests), null);
        }

        [TestMethod]
        public void HandleNavigationFailure_DoesNotThrow_ForNullPageType()
        {
            ShellViewModel.HandleNavigationFailure(null, new InvalidOperationException("simulated navigation failure"));
        }

        [TestMethod]
        public void HandleNavigationFailure_DoesNotThrow_ForBothInputsPresent()
        {
            ShellViewModel.HandleNavigationFailure(typeof(ShellViewModelTests), new InvalidOperationException("simulated navigation failure"));
        }
    }
}