public void ItemContainerGeneratorBasicTest()
{
TestGeneratorHost host = new TestGeneratorHost();
ItemContainerGenerator generator = new ItemContainerGenerator(host);
ItemsChangedEventArgs lastChangedArg = null;
generator.ItemsChanged += (sender, e) => lastChangedArg = e;
host.View.Add("item1");
Assert.AreEqual(NotifyCollectionChangedAction.Add, lastChangedArg.Action);
Assert.AreEqual(0, lastChangedArg.NewStartingIndex);
Assert.AreEqual(1, lastChangedArg.ItemsCount);
Assert.AreEqual(0, lastChangedArg.ContainersCount);
FrameworkElement container1 = generator.Generate(0);
Assert.IsTrue(host.Containers.ContainsKey("item1"));
Assert.AreEqual("item1", container1.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
host.View[0] = "item2";
Assert.IsFalse(host.Containers.ContainsKey("item1"));
Assert.IsTrue(host.Containers.ContainsKey("item2"));
Assert.IsNull(container1.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
FrameworkElement container2 = generator.Generate(0);
Assert.IsTrue(host.Containers.ContainsKey("item2"));
Assert.AreEqual("item2", container2.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
host.View.Remove("item2");
Assert.IsFalse(host.Containers.ContainsKey("item2"));
Assert.IsNull(container2.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
host.View.Add("item3");
Assert.IsFalse(host.Containers.ContainsKey("item3"));
FrameworkElement container3 = generator.Generate(0);
Assert.IsTrue(host.Containers.ContainsKey("item3"));
Assert.AreEqual("item3", container3.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
generator.Dispose();
Assert.IsFalse(host.Containers.ContainsKey("item3"));
Assert.IsNull(container3.GetValue(TestGeneratorHost.ItemForItemContainerProperty));
}