add a failing unit test.

tests/Avalonia.Controls.UnitTests/ApplicationTests.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Reactive.Subjects;
+using Avalonia.Data;
 using Avalonia.Threading;
 using Avalonia.UnitTests;
 using Xunit;
@@ -32,5 +34,20 @@ namespace Avalonia.Controls.UnitTests
                 Assert.True(raised);
             }
         }
+
+        [Fact]
+        public void Can_Bind_To_DataContext()
+        {
+            using (UnitTestApplication.Start())
+            {
+                var application = Application.Current;
+
+                application.DataContext = "Test";
+
+                application.Bind(Application.NameProperty, new Binding("."));
+
+                Assert.Equal("Test", Application.Current.Name);
+            }
+        }
     }
 }