[Test] Add a basic SwitchPresenter test case

Validates the value changes, the case, and the content

components/Primitives/tests/Primitives.Tests.projitems

@@ -9,6 +9,10 @@
     <Import_RootNamespace>PrimitivesExperiment.Tests</Import_RootNamespace>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="$(MSBuildThisFileDirectory)SwitchPresenter\SwitchPresenterLayoutSample.xaml.cs">
+      <DependentUpon>%(Filename)</DependentUpon>
+    </Compile>
+    <Compile Include="$(MSBuildThisFileDirectory)SwitchPresenter\SwitchPresenterTests.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Test_ConstrainedBox.Alignment.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Test_ConstrainedBox.AspectRatio.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Test_ConstrainedBox.Coerce.cs" />
@@ -33,4 +37,10 @@
       <Generator>MSBuild:Compile</Generator>
     </Page>
   </ItemGroup>
+  <ItemGroup>
+    <Page Include="$(MSBuildThisFileDirectory)SwitchPresenter\SwitchPresenterLayoutSample.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
 </Project>

components/Primitives/tests/SwitchPresenter/SwitchPresenterLayoutSample.xaml

@@ -0,0 +1,54 @@
+<Page x:Class="PrimitivesExperiment.Tests.SwitchPresenterLayoutSample"
+      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+      xmlns:controls="using:CommunityToolkit.WinUI.Controls"
+      xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+      xmlns:ui="using:CommunityToolkit.WinUI"
+      mc:Ignorable="d">
+
+    <StackPanel>
+        <ComboBox x:Name="Lookup"
+                  Margin="0,0,0,8"
+                  Header="Look up reservation"
+                  SelectedIndex="0">
+            <x:String>Select an option</x:String>
+            <x:String>Confirmation Code</x:String>
+            <x:String>E-ticket number</x:String>
+            <x:String>Mileage Plan number</x:String>
+        </ComboBox>
+        <!--  SwitchPresenter binds to a value  -->
+        <controls:SwitchPresenter Value="{Binding SelectedItem, ElementName=Lookup}">
+            <!--  And then only dynamically displays the Case with the matching Value  -->
+            <controls:Case Value="Confirmation Code">
+                <StackPanel>
+                    <TextBox Name="ConfirmationCodeValidator"
+                             ui:TextBoxExtensions.Regex="^[a-zA-Z]{6}$"
+                             Header="Confirmation code"
+                             PlaceholderText="6 letters" />
+                    <TextBlock Text="Thanks for entering a valid code!"
+                               Visibility="{Binding (ui:TextBoxExtensions.IsValid), ElementName=ConfirmationCodeValidator}" />
+                </StackPanel>
+            </controls:Case>
+            <controls:Case Value="E-ticket number">
+                <StackPanel>
+                    <TextBox Name="TicketValidator"
+                             ui:TextBoxExtensions.Regex="(^\d{10}$)|(^\d{13}$)"
+                             Header="E-ticket number"
+                             PlaceholderText="10 or 13 numbers" />
+                    <TextBlock Text="Thanks for entering a valid code!"
+                               Visibility="{Binding (ui:TextBoxExtensions.IsValid), ElementName=TicketValidator}" />
+                </StackPanel>
+            </controls:Case>
+            <controls:Case Value="Mileage Plan number">
+                <TextBox Name="PlanValidator"
+                         Header="Mileage Plan #"
+                         PlaceholderText="Mileage Plan #" />
+            </controls:Case>
+            <!--  You can also provide a default case if no match is found  -->
+            <controls:Case IsDefault="True">
+                <TextBlock Text="Please select a way to lookup your reservation above..." />
+            </controls:Case>
+        </controls:SwitchPresenter>
+    </StackPanel>
+</Page>

components/Primitives/tests/SwitchPresenter/SwitchPresenterLayoutSample.xaml.cs

@@ -0,0 +1,13 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace PrimitivesExperiment.Tests;
+
+public sealed partial class SwitchPresenterLayoutSample : Page
+{
+    public SwitchPresenterLayoutSample()
+    {
+        this.InitializeComponent();
+    }
+}

components/Primitives/tests/SwitchPresenter/SwitchPresenterTests.cs

@@ -0,0 +1,51 @@
+using CommunityToolkit.Tests;
+using CommunityToolkit.Tooling.TestGen;
+using CommunityToolkit.WinUI.Controls;
+
+namespace PrimitivesExperiment.Tests;
+
+[TestClass]
+public partial class SwitchPresenterTests : VisualUITestBase
+{
+    [UIThreadTestMethod]
+    public async Task SwitchPresenterLayoutTest(SwitchPresenterLayoutSample page)
+    {
+        var spresenter = page.FindDescendant<SwitchPresenter>();
+        var combobox = page.FindDescendant<ComboBox>();
+
+        Assert.IsNotNull(spresenter, "Couldn't find SwitchPresenter");
+        Assert.IsNotNull(combobox, "Couldn't find ComboBox");
+
+        var dcase = spresenter.SwitchCases.OfType<Case>().FirstOrDefault(@case => @case.IsDefault);
+
+        Assert.IsNotNull(dcase, "Couldn't find default case");
+
+        // Are we in our initial case?
+        Assert.AreEqual("Select an option", spresenter.Value, "SwitchPresenter not expected starting value");
+        Assert.AreEqual(dcase, spresenter.CurrentCase, "SwitchPresenter not at current default case");
+
+        // Can we find our matching textbox?
+        var tbox = spresenter.FindDescendant<TextBlock>();
+        Assert.IsNotNull(tbox, "Couldn't find inner textbox");
+        Assert.AreEqual("Please select a way to lookup your reservation above...", tbox.Text, "Unexpected content for SwitchPresenter default case");
+
+        // Update combobox
+        combobox.SelectedIndex = 1;
+
+        // Wait for update
+        await CompositionTargetHelper.ExecuteAfterCompositionRenderingAsync(() => { });
+
+        // Are we in the new case?
+        Assert.AreEqual("Confirmation Code", spresenter.Value);
+
+        var ccase = spresenter.SwitchCases.OfType<Case>().FirstOrDefault(@case => @case.Value?.ToString() == "Confirmation Code");
+
+        Assert.IsNotNull(ccase, "Couldn't find expected case");
+
+        Assert.AreEqual(ccase, spresenter.CurrentCase, "SwitchPresenter didn't change cases");
+
+        var txtbox = spresenter.FindDescendant<TextBox>();
+        Assert.IsNotNull(txtbox, "Couldn't find new textbox");
+        Assert.AreEqual("Confirmation code", txtbox.Header, "Textbox header not expected value");
+    }
+}