chore: fix tests

Author: ramezgerges

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml/Controls/xLoad_Back_And_Forth.xaml

@@ -2,21 +2,22 @@
 	  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 	  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
 	  xmlns:local="using:Uno.UI.RuntimeTests.Tests.Windows_UI_Xaml.Controls"
+	  xmlns:muxcontrols="using:Microsoft.UI.Xaml.Controls"
 	  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 	  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
 	  mc:Ignorable="d">
 
-	<NavigationView x:Name="NavView" x:FieldModifier="public" PaneDisplayMode="Left">
-		<NavigationView.MenuItemTemplate>
+	<muxcontrols:NavigationView x:Name="NavView" x:FieldModifier="public" PaneDisplayMode="Left">
+		<muxcontrols:NavigationView.MenuItemTemplate>
 			<DataTemplate
 				x:DataType="local:xLoadBackAndForthVM">
-				<NavigationViewItem x:Name="nvi" IsSelected="{x:Bind IsSelected, Mode=TwoWay}">
+				<muxcontrols:NavigationViewItem x:Name="nvi" IsSelected="{x:Bind IsSelected, Mode=TwoWay}">
 					<TextBlock
 						x:Name="tb"
 						x:Load="{x:Bind IsSelected, Mode=OneWay}"
 						Text="visible" />
-				</NavigationViewItem>
+				</muxcontrols:NavigationViewItem>
 			</DataTemplate>
-		</NavigationView.MenuItemTemplate>
-	</NavigationView>
+		</muxcontrols:NavigationView.MenuItemTemplate>
+	</muxcontrols:NavigationView>
 </Page>

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml/Given_xLoad.cs

@@ -495,20 +495,20 @@ public async Task When_xLoad_Set_Back_And_Forth()
 			var SUT = new xLoad_Back_And_Forth();
 			await UITestHelper.Load(SUT);
 
-			Assert.AreEqual("tb", SUT.FindFirstChild<NavigationViewItem>().FindFirstChild<ElementStub>().Name);
-			Assert.IsNull(SUT.FindFirstChild<NavigationViewItem>().FindFirstChild<TextBlock>());
+			Assert.AreEqual("tb", SUT.FindFirstChild<NavigationViewItem>()?.FindFirstChild<ElementStub>()?.Name);
+			Assert.IsNull(SUT.FindFirstChild<NavigationViewItem>()?.FindFirstChild<TextBlock>());
 
 			((List<xLoadBackAndForthVM>)SUT.NavView.MenuItemsSource)[0].IsSelected = true;
 			await UITestHelper.WaitForIdle();
 
-			Assert.AreNotEqual("tb", SUT.FindFirstChild<NavigationViewItem>().FindFirstChild<ElementStub>().Name);
-			Assert.AreEqual("visible", SUT.FindFirstChild<NavigationViewItem>().FindFirstChild<TextBlock>().Text);
+			Assert.AreNotEqual("tb", SUT.FindFirstChild<NavigationViewItem>()?.FindFirstChild<ElementStub>()?.Name);
+			Assert.AreEqual("visible", SUT.FindFirstChild<NavigationViewItem>()?.FindFirstChild<TextBlock>()?.Text);
 
 			((List<xLoadBackAndForthVM>)SUT.NavView.MenuItemsSource)[0].IsSelected = false;
 			await UITestHelper.WaitForIdle();
 
-			Assert.AreEqual("tb", SUT.FindFirstChild<NavigationViewItem>().FindFirstChild<ElementStub>().Name);
-			Assert.IsNull(SUT.FindFirstChild<NavigationViewItem>().FindFirstChild<TextBlock>());
+			Assert.AreEqual("tb", SUT.FindFirstChild<NavigationViewItem>()?.FindFirstChild<ElementStub>()?.Name);
+			Assert.IsNull(SUT.FindFirstChild<NavigationViewItem>()?.FindFirstChild<TextBlock>());
 		}
 	}
 }