Ensure TouchBehavior.LongPressCompleted event fires when `LongPress…

…Command is null` (#2239)

* Use `CanExecute` to match TapGesture

* Create GestureManagerTests.cs

* Update GestureManagerTests.cs

* Rename `sender` -> `touchBehavior`

* Resolve failing Unit Tests

* Update GestureManagerTests.cs

---------

Co-authored-by: Shaun Lawrence <shaunrlawrence@gmail.com>

src/CommunityToolkit.Maui.UnitTests/Behaviors/GestureManagerTests.cs

@@ -0,0 +1,123 @@
+using CommunityToolkit.Maui.Behaviors;
+using CommunityToolkit.Maui.Core;
+using Xunit;
+
+namespace CommunityToolkit.Maui.UnitTests.Behaviors;
+
+public class GestureManagerTests : BaseTest
+{
+	[Fact]
+	public void HandleUserInteraction_ShouldUpdateInteractionStatus()
+	{
+		// Arrange
+		var touchBehavior = new TouchBehavior();
+		var interactionStatus = TouchInteractionStatus.Completed;
+
+		// Act
+		GestureManager.HandleUserInteraction(in touchBehavior, in interactionStatus);
+
+		// Assert
+		Assert.Equal(interactionStatus, touchBehavior.CurrentInteractionStatus);
+	}
+
+	[Theory]
+	[InlineData(HoverStatus.Entered, HoverState.Hovered)]
+	[InlineData(HoverStatus.Exited, HoverState.Default)]
+	public void HandleHover_ShouldUpdateHoverStateAndStatus(HoverStatus hoverStatus, HoverState expectedHoverState)
+	{
+		// Arrange
+		var touchBehavior = new TouchBehavior
+		{
+			IsEnabled = true
+		};
+
+		// Act
+		GestureManager.HandleHover(in touchBehavior, in hoverStatus);
+
+		// Assert
+		Assert.Equal(expectedHoverState, touchBehavior.CurrentHoverState);
+		Assert.Equal(hoverStatus, touchBehavior.CurrentHoverStatus);
+	}
+
+	[Theory]
+	[InlineData(TouchStatus.Started, true, TouchState.Pressed)]
+	[InlineData(TouchStatus.Completed, true, TouchState.Default)]
+	[InlineData(TouchStatus.Canceled, false, TouchState.Default)]
+	public void HandleTouch_ShouldUpdateTouchStatusAndState(TouchStatus status, bool isEnabled, TouchState expectedTouchState)
+	{
+		// Arrange
+		var touchBehavior = new TouchBehavior
+		{
+			IsEnabled = isEnabled,
+			Element = new Label()
+		};
+		var tappedCompletedRaised = false;
+		touchBehavior.TouchGestureCompleted += HandleTouchGestureCompleted;
+
+		// Act
+		var gestureManager = new GestureManager();
+		gestureManager.HandleTouch(in touchBehavior, in status);
+
+		// Assert
+		Assert.Equal(expectedTouchState, touchBehavior.CurrentTouchState);
+		Assert.Equal(status is TouchStatus.Completed && isEnabled, tappedCompletedRaised);
+
+		void HandleTouchGestureCompleted(object? sender, TouchGestureCompletedEventArgs e)
+		{
+			touchBehavior.TouchGestureCompleted -= HandleTouchGestureCompleted;
+			tappedCompletedRaised = true;
+		}
+	}
+
+	[Fact]
+	public async Task ChangeStateAsync_ShouldUpdateVisualState()
+	{
+		// Arrange
+		var touchBehavior = new TouchBehavior
+		{
+			IsEnabled = true,
+			Element = new Label()
+		};
+		var token = new CancellationTokenSource().Token;
+
+		// Act
+		var gestureManager = new GestureManager();
+		await gestureManager.ChangeStateAsync(touchBehavior, false, token);
+
+		// Assert
+		Assert.Equal(TouchState.Default, touchBehavior.CurrentTouchState);
+		Assert.Equal(HoverState.Default, touchBehavior.CurrentHoverState);
+	}
+
+	[Fact(Timeout = (int)TestDuration.Short)]
+	public async Task HandleLongPress_ShouldRaiseLongPressCompleted()
+	{
+		// Arrange
+		var touchBehavior = new TouchBehavior
+		{
+			IsEnabled = true,
+			Element = new Button(),
+			CurrentTouchState = TouchState.Pressed,
+			CurrentInteractionStatus = TouchInteractionStatus.Started,
+			LongPressDuration = 100,
+			LongPressCommand = null
+		};
+		var longPressCompletedRaised = false;
+		touchBehavior.LongPressCompleted += HandleLongPressCompleted;
+
+		// Act
+		var gestureManager = new GestureManager();
+		var token = new CancellationTokenSource().Token;
+		await gestureManager.HandleLongPress(touchBehavior, token);
+
+		// Assert
+		Assert.True(longPressCompletedRaised);
+
+
+		void HandleLongPressCompleted(object? sender, LongPressCompletedEventArgs e)
+		{
+			touchBehavior.LongPressCompleted -= HandleLongPressCompleted;
+			longPressCompletedRaised = true;
+		}
+	}
+}