feat: Trigger OnCancel and OnClose event on dialog

CHANGELOG.md

@@ -15,6 +15,8 @@ All notable changes to **bUnit** will be documented in this file. The project ad
 
 - Support for custom service provider factories (`IServiceProviderFactory<TContainerBuilder>`). This enables the use of Autofac and other frameworks for dependency injection like on real-world ASP.NET Core / Blazor projects. By [@inf9144](https://github.com/inf9144).
 
+- Ability to raise the `oncancel` and `onclose` event, that was introduced with .NET 8.
+
 ## [1.23.9] - 2023-09-06
 
 ### Fixed

src/bunit.web/EventDispatchExtensions/DialogEventDispatchExtensions.cs

@@ -0,0 +1,31 @@
+using AngleSharp.Dom;
+
+#if NET8_0_OR_GREATER
+namespace Bunit;
+
+/// <summary>
+/// Dialog helper events.
+/// </summary>
+public static class DialogEventDispatchExtensions
+{
+	/// <summary>
+	/// Raises the <c>@oncancel</c> event on <paramref name="element"/>, passing an empty (<see cref="EventArgs.Empty"/>).
+	/// </summary>
+	public static void Cancel(this IElement element) => _ = CancelAsync(element);
+
+	/// <summary>
+	/// Raises the <c>@oncancel</c> event on <paramref name="element"/>, passing an empty (<see cref="EventArgs.Empty"/>).
+	/// </summary>
+	public static Task CancelAsync(this IElement element) => element.TriggerEventAsync("oncancel", EventArgs.Empty);
+
+	/// <summary>
+	///	Raises the <c>@onclose</c> event on <paramref name="element"/>, passing an empty (<see cref="EventArgs.Empty"/>.
+	///	</summary>
+	public static void Close(this IElement element) => _ = CloseAsync(element);
+
+	/// <summary>
+	///	Raises the <c>@onclose</c> event on <paramref name="element"/>, passing an empty (<see cref="EventArgs.Empty"/>.
+	///	</summary>
+	public static Task CloseAsync(this IElement element) => element.TriggerEventAsync("onclose", EventArgs.Empty);
+}
+#endif