Add Initial Tests for WrapPanel to test layout logic.

Author: michael-hawker

UnitTests/UnitTests.UWP/UI/Controls/Test_WrapPanel.cs

@@ -0,0 +1,122 @@
+// 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.Linq;
+using System.Threading.Tasks;
+using Microsoft.Toolkit.Uwp;
+using Microsoft.Toolkit.Uwp.UI;
+using Microsoft.Toolkit.Uwp.UI.Controls;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Microsoft.VisualStudio.TestTools.UnitTesting.AppContainer;
+using Windows.Foundation;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Markup;
+
+namespace UnitTests.UI.Controls
+{
+    [TestClass]
+    public class Test_WrapPanel : VisualUITestBase
+    {
+        [TestCategory("WrapPanel")]
+        [TestMethod]
+        public async Task Test_WrapPanel_Normal_Horizontal()
+        {
+            await App.DispatcherQueue.EnqueueAsync(async () =>
+            {
+                var treeRoot = XamlReader.Load(@"<Page
+    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"">
+    <controls:WrapPanel x:Name=""WrapPanel"">
+        <Border Width=""100"" Height=""50""/>
+        <Border Width=""100"" Height=""50""/>
+        <Border Width=""100"" Height=""50""/>
+    </controls:WrapPanel>
+</Page>") as FrameworkElement;
+
+                var expected = new (int u, int v)[]
+                {
+                    (0, 0),
+                    (100, 0),
+                    (200, 0),
+                };
+
+                Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
+
+                // Initialize Visual Tree
+                await SetTestContentAsync(treeRoot);
+
+                var panel = treeRoot.FindChild("WrapPanel") as WrapPanel;
+
+                Assert.IsNotNull(panel, "Could not find WrapPanel in tree.");
+
+                // Force Layout calculations
+                panel.UpdateLayout();
+
+                var children = panel.Children.Select(item => item as FrameworkElement).ToArray();
+
+                Assert.AreEqual(3, panel.Children.Count);
+
+                // Check all children are in expected places.
+                for (int i = 0; i < children.Count(); i++)
+                {
+                    var transform = treeRoot.CoordinatesTo(children[i]);
+                    Assert.AreEqual(expected[i].u, transform.X);
+                    Assert.AreEqual(expected[i].v, transform.Y);
+                }
+            });
+        }
+
+        [TestCategory("WrapPanel")]
+        [TestMethod]
+        public async Task Test_WrapPanel_Normal_Vertical()
+        {
+            await App.DispatcherQueue.EnqueueAsync(async () =>
+            {
+                var treeRoot = XamlReader.Load(@"<Page
+    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"">
+    <controls:WrapPanel x:Name=""WrapPanel"" Orientation=""Vertical"">
+        <Border Width=""100"" Height=""50""/>
+        <Border Width=""100"" Height=""50""/>
+        <Border Width=""100"" Height=""50""/>
+    </controls:WrapPanel>
+</Page>") as FrameworkElement;
+
+                var expected = new (int u, int v)[]
+                {
+                    (0, 0),
+                    (0, 50),
+                    (0, 100),
+                };
+
+                Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
+
+                // Initialize Visual Tree
+                await SetTestContentAsync(treeRoot);
+
+                var panel = treeRoot.FindChild("WrapPanel") as WrapPanel;
+
+                Assert.IsNotNull(panel, "Could not find WrapPanel in tree.");
+
+                // Force Layout calculations
+                panel.UpdateLayout();
+
+                var children = panel.Children.Select(item => item as FrameworkElement).ToArray();
+
+                Assert.AreEqual(3, panel.Children.Count);
+
+                // Check all children are in expected places.
+                for (int i = 0; i < children.Count(); i++)
+                {
+                    var transform = treeRoot.CoordinatesTo(children[i]);
+                    Assert.AreEqual(expected[i].u, transform.X);
+                    Assert.AreEqual(expected[i].v, transform.Y);
+                }
+            });
+        }
+    }
+}

UnitTests/UnitTests.UWP/UnitTests.UWP.csproj

@@ -204,6 +204,7 @@
     <Compile Include="UI\Controls\Test_TokenizingTextBox_General.cs" />
     <Compile Include="UI\Controls\Test_TokenizingTextBox_InterspersedCollection.cs" />
     <Compile Include="UI\Controls\Test_ListDetailsView.cs" />
+    <Compile Include="UI\Controls\Test_WrapPanel.cs" />
     <Compile Include="UI\Controls\Test_UniformGrid_AutoLayout.cs" />
     <Compile Include="UI\Controls\Test_UniformGrid_RowColDefinitions.cs" />
     <Compile Include="UI\Controls\Test_UniformGrid_FreeSpots.cs" />