ListDetailsView: unfocus details on selection changed

UITests/UITests.Tests.Shared/Controls/ListDetailsViewTest.cs

@@ -0,0 +1,49 @@
+// 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.
+
+using Microsoft.Windows.Apps.Test.Foundation.Controls;
+using Windows.UI.Xaml.Tests.MUXControls.InteractionTests.Common;
+using Windows.UI.Xaml.Tests.MUXControls.InteractionTests.Infra;
+using System.Threading.Tasks;
+
+#if USING_TAEF
+using WEX.Logging.Interop;
+using WEX.TestExecution;
+using WEX.TestExecution.Markup;
+#else
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+#endif
+
+namespace UITests.Tests
+{
+
+    [TestClass]
+    public class ListDetailsViewTest : UITestBase
+    {
+        [ClassInitialize]
+        [TestProperty("RunAs", "User")]
+        [TestProperty("Classification", "ScenarioTestSuite")]
+        [TestProperty("Platform", "Any")]
+        public static void ClassInitialize(TestContext testContext)
+        {
+            TestEnvironment.Initialize(testContext, WinUICsUWPSampleApp);
+        }
+
+        [TestMethod]
+        [TestPage("ListDetailsViewTestPage")]
+        public async Task LoseFocusOnNoSelection()
+        {
+            var listFirst = FindElement.ByName("ItemFirst");
+            listFirst.Click();
+
+            new Edit(FindElement.ByName("TextArea")).SendKeys("Test");
+
+            FindElement.ByName("ItemSecond").Click();
+
+            listFirst.Click();
+
+            Verify.AreEqual("TestFirst", FindElement.ByName("TextArea").GetText());
+        }
+    }
+}

UITests/UITests.Tests.Shared/Controls/ListDetailsViewTestPage.xaml

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+<Page x:Class="UITests.App.Pages.ListDetailsViewTestPage"
+      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+      xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
+      Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+
+    <controls:ListDetailsView 
+        x:Name="ListDetailsView"
+        NoSelectionContent="No item selected" >
+        <controls:ListDetailsView.ItemTemplate>
+            <DataTemplate x:DataType="x:String">
+                <TextBlock Text="Item" AutomationProperties.Name="{x:Bind Insert(0, 'Item' )}" />
+            </DataTemplate>
+        </controls:ListDetailsView.ItemTemplate>
+        <controls:ListDetailsView.DetailsTemplate>
+            <DataTemplate x:DataType="x:String">
+                <TextBox Text="{x:Bind}" AutomationProperties.Name="TextArea"/>
+            </DataTemplate>
+        </controls:ListDetailsView.DetailsTemplate>
+    </controls:ListDetailsView>
+</Page>

UITests/UITests.Tests.Shared/Controls/ListDetailsViewTestPage.xaml.cs

@@ -0,0 +1,26 @@
+// 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.
+
+using System.Collections.ObjectModel;
+using Windows.UI.Xaml.Controls;
+
+namespace UITests.App.Pages
+{
+    /// <summary>
+    /// An empty page that can be used on its own or navigated to within a Frame.
+    /// </summary>
+    public sealed partial class ListDetailsViewTestPage : Page
+    {
+        public ListDetailsViewTestPage()
+        {
+            this.InitializeComponent();
+
+            ListDetailsView.ItemsSource = new string[]
+            {
+                "First",
+                "Second",
+            };
+        }
+    }
+}