1 files changed, 78 insertions, 0 deletions
diff --git a/Xamarin.Forms.Xaml.UnitTests/Issues/Unreported005.xaml.cs b/Xamarin.Forms.Xaml.UnitTests/Issues/Unreported005.xaml.cs
new file mode 100644
index 00000000..d00f1f41
--- /dev/null
+++ b/Xamarin.Forms.Xaml.UnitTests/Issues/Unreported005.xaml.cs
@@ -0,0 +1,78 @@
+using System;
+using NUnit.Framework;
+
+namespace Xamarin.Forms.Xaml.UnitTests
+{
+	public abstract class Unreported005RelativeToView : IMarkupExtension
+	{
+		protected Unreported005RelativeToView()
+		{
+			Factor = 1;
+		}
+
+		public string ElementName { get; set; }
+
+		public double Factor { get; set; }
+
+		public double Constant { get; set; }
+
+		public object ProvideValue(IServiceProvider serviceProvider)
+		{
+			var element = new ReferenceExtension { Name = ElementName }.ProvideValue(serviceProvider) as View;
+			if (element != null) {
+				var result = Constraint.RelativeToView(element, (layout, view) => DeterminePosition(view) + Constant);
+				return result;
+			}
+			return null;
+		}
+
+		protected virtual double DeterminePosition(VisualElement view)
+		{
+			var result = DetermineStart(view) + DetermineExtent(view) * Factor;
+			return result;
+		}
+
+		protected abstract double DetermineExtent(VisualElement view);
+
+		protected abstract double DetermineStart(VisualElement view);
+	}
+
+	public class Unreported005RelativeToViewHorizontal : Unreported005RelativeToView
+	{
+		protected override double DetermineExtent(VisualElement view)
+		{
+			return view.Width;
+		}
+
+		protected override double DetermineStart(VisualElement view)
+		{
+			return view.X;
+		}
+	}
+
+	//[XamlCompilation(XamlCompilationOptions.Skip)]
+	public partial class Unreported005 : ContentPage
+	{
+		public Unreported005()
+		{
+			InitializeComponent();
+		}
+
+		public Unreported005(bool useCompiledXaml)
+		{
+			//this stub will be replaced at compile time
+		}
+
+		[TestFixture]
+		class Tests
+		{
+			[TestCase(true), TestCase(false)]
+			public void CustomMarkupExtensionWorks(bool useCompiledXaml)
+			{
+				var page = new Unreported005(useCompiledXaml);
+				Assert.That(RelativeLayout.GetXConstraint(page.after), Is.TypeOf<Constraint>());
+				Assert.NotNull(RelativeLayout.GetXConstraint(page.after));
+			}
+		}
+	}
+}
+\ No newline at end of file