1 files changed, 181 insertions, 0 deletions

diff --git a/Xamarin.Forms.Core.UnitTests/ControlTemplateTests.cs b/Xamarin.Forms.Core.UnitTests/ControlTemplateTests.cs
new file mode 100644
index 00000000..ffced2d2
--- /dev/null
+++ b/Xamarin.Forms.Core.UnitTests/ControlTemplateTests.cs
@@ -0,0 +1,181 @@
+using System;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using NUnit.Framework;
+using Xamarin.Forms;
+
+namespace Xamarin.Forms.Core.UnitTests
+{
+	[TestFixture]
+	public class ControlTemplateTests : BaseTestFixture
+	{
+		[SetUp]
+		public override void Setup()
+		{
+			base.Setup ();
+			Device.PlatformServices = new MockPlatformServices ();
+		}
+
+		[TearDown]
+		public override void TearDown()
+		{
+			base.TearDown ();
+			Device.PlatformServices = null;
+		}
+
+		public class ContentControl : StackLayout
+		{
+			public ContentControl ()
+			{
+				var label = new Label ();
+				label.SetBinding (Label.TextProperty, new TemplateBinding ("Name"));
+
+				Children.Add (label);
+				Children.Add (new ContentPresenter ());
+			}
+		}
+
+		public class PresenterWrapper : ContentView
+		{
+			public PresenterWrapper ()
+			{
+				Content = new ContentPresenter ();
+			}
+		}
+
+		public class TestView : ContentView
+		{
+			public static readonly BindableProperty NameProperty =
+				BindableProperty.Create (nameof (Name), typeof (string), typeof (TestView), default(string));
+
+			public string Name
+			{
+				get { return (string)GetValue (NameProperty); }
+				set { SetValue (NameProperty, value); }
+			}
+
+			public TestView ()
+			{
+				ControlTemplate = new ControlTemplate(typeof (ContentControl));
+			}
+		}
+
+		[Test]
+		public void ResettingControlTemplateNullsPresenterContent ()
+		{
+			var testView = new TestView {
+				Platform = new UnitPlatform (),
+				ControlTemplate = new ControlTemplate (typeof (PresenterWrapper))
+			};
+
+			var label = new Label ();
+			testView.Content = label;
+			var originalPresenter = (ContentPresenter)testView.LogicalChildren[0].LogicalChildren[0];
+
+			Assert.AreEqual (label, originalPresenter.Content);
+
+			testView.ControlTemplate = new ControlTemplate (typeof (PresenterWrapper));
+
+			Assert.IsNull (originalPresenter.Content);
+		}
+
+		[Test]
+		public void NestedTemplateBindings ()
+		{
+			var testView = new TestView ();
+			var label = (Label)testView.LogicalChildren[0].LogicalChildren[0];
+
+			testView.Platform = new UnitPlatform ();
+			Assert.IsNull (label.Text);
+
+			testView.Name = "Bar";
+			Assert.AreEqual ("Bar", label.Text);
+		}
+
+		[Test]
+		public void ParentControlTemplateDoesNotClearChildTemplate ()
+		{
+			var parentView = new TestView ();
+			var childView = new TestView ();
+			parentView.Platform = new UnitPlatform ();
+
+			parentView.Content = childView;
+			childView.Content = new Button ();
+			var childPresenter = (ContentPresenter)childView.LogicalChildren[0].LogicalChildren[1];
+
+			parentView.ControlTemplate = new ControlTemplate (typeof (ContentControl));
+			Assert.IsNotNull (childPresenter.Content);
+		}
+
+		[Test]
+		public void NullConstructor ()
+		{
+			Assert.Throws<ArgumentNullException> (() => new ControlTemplate (null));
+		}
+
+		class TestPage : ContentPage
+		{
+			public static readonly BindableProperty NameProperty =
+				BindableProperty.Create (nameof (Name), typeof (string), typeof (TestPage), null);
+
+			public string Name
+			{
+				get { return (string)GetValue (NameProperty); }
+				set { SetValue (NameProperty, value); }
+			}
+		}
+
+		class TestContent : ContentView
+		{
+			public TestContent ()
+			{
+				Content = new Entry ();
+				Content.SetBinding (Entry.TextProperty, new TemplateBinding ("Name", BindingMode.TwoWay));
+			}
+		}
+
+		class ViewModel : INotifyPropertyChanged
+		{
+			string name;
+
+			public string Name
+			{
+				get { return name; }
+				set
+				{
+					if (name == value)
+						return;
+					name = value;
+					OnPropertyChanged ();
+				}
+			}
+
+			public event PropertyChangedEventHandler PropertyChanged;
+
+			protected virtual void OnPropertyChanged ([CallerMemberName] string propertyName = null)
+			{
+				PropertyChanged?.Invoke (this, new PropertyChangedEventArgs (propertyName));
+			}
+		}
+
+		[Test]
+		public void DoubleTwoWayBindingWorks ()
+		{
+			var page = new TestPage ();
+			page.Platform = new UnitPlatform ();
+			var viewModel = new ViewModel {
+				Name = "Jason"
+			};
+			page.BindingContext = viewModel;
+
+			page.ControlTemplate = new ControlTemplate (typeof (TestContent));
+			page.SetBinding (TestPage.NameProperty, "Name");
+
+			var entry = ((ContentView)page.LogicalChildren[0]).Content as Entry;
+			((IElementController)entry).SetValueFromRenderer (Entry.TextProperty, "Bar");
+			viewModel.Name = "Raz";
+
+			Assert.AreEqual ("Raz", entry.Text);
+		}
+	}
+}
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