Add initial basic tests for infinite dimension with ConstrainedBox

Author: michael-hawker

UnitTests/UnitTests.UWP/UI/Controls/Test_ConstrainedBox.Coerce.cs

@@ -16,6 +16,9 @@
 
 namespace UnitTests.UWP.UI.Controls
 {
+    /// <summary>
+    /// These tests check for the various values which can be coerced and changed if out of bounds for each property.
+    /// </summary>
     public partial class Test_ConstrainedBox : VisualUITestBase
     {
         [TestCategory("ConstrainedBox")]

UnitTests/UnitTests.UWP/UI/Controls/Test_ConstrainedBox.Combined.cs

@@ -17,6 +17,9 @@
 
 namespace UnitTests.UWP.UI.Controls
 {
+    /// <summary>
+    /// These tests check multiple constraints are applied together in the correct order.
+    /// </summary>
     public partial class Test_ConstrainedBox : VisualUITestBase
     {
         [TestCategory("ConstrainedBox")]

UnitTests/UnitTests.UWP/UI/Controls/Test_ConstrainedBox.Infinity.cs

@@ -0,0 +1,110 @@
+// 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.UWP.UI.Controls
+{
+    /// <summary>
+    /// These tests check for cases where one of the bounds provided by the parent panel is infinite.
+    /// </summary>
+    public partial class Test_ConstrainedBox : VisualUITestBase
+    {
+        [TestCategory("ConstrainedBox")]
+        [TestMethod]
+        public async Task Test_ConstrainedBox_AllInfinite_AspectWidthFallback()
+        {
+            await App.DispatcherQueue.EnqueueAsync(async () =>
+            {
+                // Even though we constrain the size of the ScrollViewer, it initially reports infinite measure
+                // which is what we want to test. We constrain the dimension so that we have a specific value
+                // that we can measure against. If we instead restrained the inner Border, it'd just set
+                // it's side within the constrained space of the parent layout...
+                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"">
+    <ScrollViewer HorizontalScrollMode=""Enabled"" HorizontalScrollBarVisibility=""Visible""
+                  VerticalScrollMode=""Enabled"" VerticalScrollBarVisibility=""Visible""
+                  Width=""200"">
+      <controls:ConstrainedBox x:Name=""ConstrainedBox"" AspectRatio=""2:1"">
+        <Border HorizontalAlignment=""Stretch"" VerticalAlignment=""Stretch"" Background=""Red""/>
+      </controls:ConstrainedBox>
+    </ScrollViewer>
+</Page>") as FrameworkElement;
+
+                Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
+
+                // Initialize Visual Tree
+                await SetTestContentAsync(treeRoot);
+
+                var panel = treeRoot.FindChild("ConstrainedBox") as ConstrainedBox;
+
+                Assert.IsNotNull(panel, "Could not find ConstrainedBox in tree.");
+
+                // Force Layout calculations
+                panel.UpdateLayout();
+
+                var child = panel.Content as Border;
+
+                Assert.IsNotNull(child, "Could not find inner Border");
+
+                // Check Size
+                Assert.AreEqual(200, child.ActualWidth, 0.01, "Actual width does not meet expected value of 200");
+                Assert.AreEqual(100, child.ActualHeight, 0.01, "Actual height does not meet expected value of 100");
+            });
+        }
+
+        [TestCategory("ConstrainedBox")]
+        [TestMethod]
+        public async Task Test_ConstrainedBox_AllInfinite_AspectHeightFallback()
+        {
+            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"">
+    <ScrollViewer HorizontalScrollMode=""Enabled"" HorizontalScrollBarVisibility=""Visible""
+                  VerticalScrollMode=""Enabled"" VerticalScrollBarVisibility=""Visible""
+                  Height=""200"">
+      <controls:ConstrainedBox x:Name=""ConstrainedBox"" AspectRatio=""1:2"">
+        <Border HorizontalAlignment=""Stretch"" VerticalAlignment=""Stretch"" Background=""Red""/>
+      </controls:ConstrainedBox>
+    </ScrollViewer>
+</Page>") as FrameworkElement;
+
+                Assert.IsNotNull(treeRoot, "Could not load XAML tree.");
+
+                // Initialize Visual Tree
+                await SetTestContentAsync(treeRoot);
+
+                var panel = treeRoot.FindChild("ConstrainedBox") as ConstrainedBox;
+
+                Assert.IsNotNull(panel, "Could not find ConstrainedBox in tree.");
+
+                // Force Layout calculations
+                panel.UpdateLayout();
+
+                var child = panel.Content as Border;
+
+                Assert.IsNotNull(child, "Could not find inner Border");
+
+                // Check Size
+                Assert.AreEqual(100, child.ActualWidth, 0.01, "Actual width does not meet expected value of 100");
+                Assert.AreEqual(200, child.ActualHeight, 0.01, "Actual height does not meet expected value of 200");
+            });
+        }
+    }
+}

UnitTests/UnitTests.UWP/UnitTests.UWP.csproj

@@ -229,6 +229,7 @@
     <Compile Include="UI\Collection\Test_IncrementalLoadingCollection.cs" />
     <Compile Include="UI\Controls\Test_Carousel.cs" />
     <Compile Include="UI\Controls\Test_BladeView.cs" />
+    <Compile Include="UI\Controls\Test_ConstrainedBox.Infinity.cs" />
     <Compile Include="UI\Controls\Test_ConstrainedBox.AspectRatio.cs" />
     <Compile Include="UI\Controls\Test_ConstrainedBox.Coerce.cs" />
     <Compile Include="UI\Controls\Test_ConstrainedBox.Multiple.cs" />