Fixed SpinnerViewTests

UnitTests/Views/SpinnerViewTests.cs

@@ -42,6 +42,7 @@ public class SpinnerViewTests
         // Dispose clears timeout
         view.Dispose ();
         Assert.Empty (Application.MainLoop._timeouts);
+        Application.Top.Dispose ();
     }
 
     [Fact]
@@ -62,6 +63,7 @@ public class SpinnerViewTests
 
         expected = "/";
         TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+        Application.Top.Dispose ();
     }
 
     [Fact]
@@ -94,6 +96,7 @@ public class SpinnerViewTests
 
         //expected = "|";
         //TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+        Application.Top.Dispose ();
     }
 
     private SpinnerView GetSpinnerView ()