public void FreezableResourceContainerTest()
{
int resourcesChangedCount = 0;
object resourceValue;
Freezable freezable = new Freezable();
freezable.ResourcesChanged += (sender, e) => resourcesChangedCount++;
FrameworkElement element = new FrameworkElement();
element.Resources = new ResourceDictionary();
element.Resources.Add("key1", "value1");
Assert.IsFalse(freezable.TryGetResource("key1", out resourceValue));
freezable.TrySetContextParent(element);
Assert.AreEqual(1, resourcesChangedCount);
Assert.IsTrue(freezable.TryGetResource("key1", out resourceValue));
Assert.AreEqual("value1", resourceValue);
element.Resources.Add("key2", "value2");
Assert.AreEqual(2, resourcesChangedCount);
Assert.IsTrue(freezable.TryGetResource("key2", out resourceValue));
Assert.AreEqual("value2", resourceValue);
}