fix: Add VM Disposal in Tests

CHANGELOG.md

@@ -15,6 +15,7 @@ Prefix your items with `(Template)` if the change is about the template and not
 - Updated the Segoe MDL2 Assets font to fix an issue with the Flip View icons on Windows.
 - Optimized the .NET workloads install process.
 - Fixed the iOS application icon size.
+- Added VM Disposal in Functional Tests.
 
 ## 3.8.X
 - Updated from .NET 8 to .NET 9.

src/app/ApplicationTemplate.Presentation/ViewModels/Extensions/ISectionsNavigator.Extensions.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Linq;
 using System.Reactive.Linq;
+using System.Threading.Tasks;
+using System.Threading;
 using Chinook.StackNavigation;
 
 namespace Chinook.SectionsNavigation;
@@ -51,4 +53,43 @@ public static IObservable<string> ObserveActiveSectionName(this ISectionsNavigat
 				var state = args.EventArgs.CurrentState;
 				return state.ActiveSection.Name;
 			});
+
+	/// <summary>
+	/// Clears the sections and sets the active section to <paramref name="activeSectionName"/> if not null or empty.
+	/// </summary>
+	/// <param name="sectionsNavigator"><see cref="ISectionsNavigator"/>.</param>
+	/// <param name="ct">The cancellation token.</param>
+	/// <param name="activeSectionName">The active section name to set after clearing them all.</param>
+	/// <remarks>
+	/// There are good chances that the page requesting this operation gets disposed, so you should use <see cref="CancellationToken.None"/>.
+	/// <br/>
+	/// If you don't want any section set as active don't provide <paramref name="activeSectionName"/>.
+	/// </remarks>
+	public static async Task ClearSections(this ISectionsNavigator sectionsNavigator, CancellationToken ct, string activeSectionName = default)
+	{
+		// Clearing those pages prevents bindings from updating in background.
+		// For better performance, it's better to re-create the pages when we'll need them.
+		foreach (var section in sectionsNavigator.State.Sections.Values)
+		{
+			await section.Clear(ct);
+		}
+
+		if (!string.IsNullOrEmpty(activeSectionName))
+		{
+			await sectionsNavigator.SetActiveSection(ct, activeSectionName);
+		}
+	}
+
+	/// <summary>
+	/// Closes all modals.
+	/// </summary>
+	/// <param name="sectionsNavigator"><see cref="ISectionsNavigator"/>.</param>
+	/// <param name="ct">The cancellation token.</param>
+	public static async Task CloseModals(this ISectionsNavigator sectionsNavigator, CancellationToken ct)
+	{
+		foreach (var modal in sectionsNavigator.State.Modals)
+		{
+			await sectionsNavigator.CloseModal(ct, SectionsNavigatorRequest.GetCloseModalRequest(modalName: modal.Name));
+		}
+	}
 }

src/app/ApplicationTemplate.Tests.Functional/ForceUpdate/ForceUpdatesShould.cs

@@ -2,8 +2,9 @@
 using System.Reactive.Linq;
 using System.Threading.Tasks;
 using ApplicationTemplate.DataAccess;
+using ApplicationTemplate.Tests;
 
-namespace ApplicationTemplate.Tests;
+namespace ForceUpdate;
 
 /// <summary>
 /// Tests for the forced update flow.

src/app/ApplicationTemplate.Tests.Functional/FunctionalTestBase.cs

@@ -241,11 +241,16 @@ async Task IAsyncLifetime.InitializeAsync()
 		ViewModelBase.DefaultServiceProvider.Should().BeSameAs(_coreStartup.ServiceProvider, because: "We want the ViewModels of this test to use the services that we just initialized.");
 	}
 
-	Task IAsyncLifetime.DisposeAsync()
+	async Task IAsyncLifetime.DisposeAsync()
 	{
+		// To prevent scheduled tasks in view models from running after the test is completed.
+		// Once the test is finished, the view models should no longer be active.
+		// Therefore, we clear the stack navigator, which disposes of all view models.
+		await GetService<ISectionsNavigator>().CloseModals(CancellationToken.None);
+		await GetService<ISectionsNavigator>().ClearSections(CancellationToken.None);
+
 		_coreStartup.Dispose();
 		_backButtonSource.Dispose();
-		return Task.CompletedTask;
 	}
 
 	private sealed class FunctionalTestBackButtonSource : IBackButtonSource

src/app/ApplicationTemplate.Tests.Functional/Posts/EditPostPageViewModelShould.cs

@@ -2,9 +2,10 @@
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using ApplicationTemplate.Tests;
 using Xunit.Abstractions;
 
-namespace ApplicationTemplate.Tests;
+namespace Posts;
 
 public sealed class EditPostPageViewModelShould : FunctionalTestBase
 {