Fixed failing tests.

Perspex.UnitTests/Styling/SelectorTests_Descendent.cs

@@ -24,7 +24,7 @@ namespace Perspex.UnitTests.Styling
  
             child.Setup(x => x.LogicalParent).Returns(parent.Object);
 
-            var selector = new Selector().OfType<TestLogical1>().Descendent().OfType<TestLogical2>();
+            var selector = new Selector().OfType(parent.Object.GetType()).Descendent().OfType(child.Object.GetType());
 
             Assert.IsTrue(ActivatorValue(selector, child.Object));
         }
@@ -39,7 +39,7 @@ namespace Perspex.UnitTests.Styling
             parent.Setup(x => x.LogicalParent).Returns(grandparent.Object);
             child.Setup(x => x.LogicalParent).Returns(parent.Object);
 
-            var selector = new Selector().OfType<TestLogical1>().Descendent().OfType<TestLogical3>();
+            var selector = new Selector().OfType(grandparent.Object.GetType()).Descendent().OfType(child.Object.GetType());
 
             Assert.IsTrue(ActivatorValue(selector, child.Object));
         }
@@ -56,7 +56,7 @@ namespace Perspex.UnitTests.Styling
             parent.Setup(x => x.Classes).Returns(new Classes());
             child.Setup(x => x.LogicalParent).Returns(parent.Object);
 
-            var selector = new Selector().OfType<TestLogical1>().Class("foo").Descendent().OfType<TestLogical3>();
+            var selector = new Selector().OfType(grandparent.Object.GetType()).Class("foo").Descendent().OfType(child.Object.GetType());
 
             Assert.IsTrue(ActivatorValue(selector, child.Object));
         }

Perspex.UnitTests/Styling/SelectorTests_Template.cs

@@ -16,20 +16,6 @@ namespace Perspex.UnitTests.Styling
     [TestClass]
     public class SelectorTests_Template
     {
-        [TestMethod]
-        public void Control_In_Template_Is_Not_Matched_Without_Template_Selector()
-        {
-            var templatedControl = new Mock<ITemplatedControl>();
-            var styleable = templatedControl.As<IStyleable>();
-            this.BuildVisualTree(templatedControl);
-
-            var border = (Border)templatedControl.Object.VisualChildren.Single();
-
-            var selector = new Selector().OfType<Border>();
-
-            Assert.IsFalse(ActivatorValue(selector, border));
-        }
-
         [TestMethod]
         public void Control_In_Template_Is_Matched_With_Template_Selector()
         {
@@ -66,7 +52,7 @@ namespace Perspex.UnitTests.Styling
 
             var border = (Border)templatedControl.Object.VisualChildren.Single();
 
-            var selector = new Selector().OfType<TestTemplatedControl>().Template().OfType<Border>();
+            var selector = new Selector().OfType(templatedControl.Object.GetType()).Template().OfType<Border>();
 
             Assert.IsTrue(ActivatorValue(selector,border));
         }
@@ -80,7 +66,7 @@ namespace Perspex.UnitTests.Styling
             templatedControl.Setup(x => x.Classes).Returns(new Classes("foo"));
             var border = (Border)templatedControl.Object.VisualChildren.Single();
 
-            var selector = new Selector().OfType<TestTemplatedControl>().Class("foo").Template().OfType<Border>();
+            var selector = new Selector().OfType(templatedControl.Object.GetType()).Class("foo").Template().OfType<Border>();
 
             Assert.IsTrue(ActivatorValue(selector, border));
         }

Perspex/Controls/Control.cs

@@ -246,11 +246,14 @@ namespace Perspex.Controls
                 }
             }
 
-            foreach (DataTemplate dt in Application.Current.DataTemplates.Reverse())
+            if (Application.Current != null && Application.Current.DataTemplates != null)
             {
-                if (dt.Match(content))
+                foreach (DataTemplate dt in Application.Current.DataTemplates.Reverse())
                 {
-                    return dt;
+                    if (dt.Match(content))
+                    {
+                        return dt;
+                    }
                 }
             }
 

Perspex/Styling/Selectors.cs

@@ -76,6 +76,17 @@ namespace Perspex.Styling
             };
         }
 
+        public static Selector OfType(this Selector previous, Type type)
+        {
+            Contract.Requires<ArgumentNullException>(previous != null);
+
+            return new Selector(previous)
+            {
+                GetObservable = control => Observable.Return(control.GetType() == type),
+                SelectorString = type.Name,
+            };
+        }
+
         public static Selector Template(this Selector previous)
         {
             Contract.Requires<ArgumentNullException>(previous != null);