public void Manually_Updating_The_Field_Value_Should_Update_The_Graph_And_Fire_Change_Event()
{
//cache the old address, then replace
var oldAddress = Student.School.Address;
var newAddress = TestUtil.CreateAddress("Paris");
Student.School.Address = newAddress;
//still has the old instance?
Assert.AreEqual(oldAddress.City, Dependency.LeafValue);
Assert.AreNotSame(newAddress, Dependency.LeafNode.ParentNode.NodeValue);
Assert.AreSame(oldAddress, Dependency.LeafNode.ParentNode.NodeValue);
Assert.AreEqual(0, ChangeEventCount);
//update the node value manually
Dependency.LeafNode.ParentNode.SetNodeValue(newAddress, true);
//update should have been performed, and the event should have fired
Assert.AreEqual("Paris", Dependency.LeafValue);
Assert.AreSame(newAddress, Dependency.LeafNode.ParentNode.NodeValue);
Assert.AreSame(newAddress, Student.School.Address);
Assert.AreEqual(1, ChangeEventCount);
Assert.AreEqual("Paris", LastEventArgs.TryGetLeafValue(""));
//the announced member name should return the field name
Assert.AreEqual("address", LastEventArgs.ChangedMemberName);
//we exchanged a member in the graph
Assert.AreEqual(DependencyChangeSource.DependencyGraphChange, LastEventArgs.Reason);
}
public void Change_On_The_Fields_Parent_Should_Update_The_Graph_Including_The_Field()
{
var school = TestUtil.CreateTestStudent("Harvard").School;
Student.School = school;
Assert.AreEqual(1, ChangeEventCount);
Assert.AreEqual(DependencyChangeSource.DependencyGraphChange, LastEventArgs.Reason);
//changed reference for field and field's City property?
Assert.AreSame(school.Address, Dependency.LeafNode.ParentNode.NodeValue);
Assert.AreEqual("Harvard", Dependency.LeafValue);
//update dependency target
school.Address.City = "New York";
Assert.AreEqual(2, ChangeEventCount);
Assert.AreEqual("New York", Dependency.LeafValue);
Assert.AreEqual("New York", LastEventArgs.TryGetLeafValue(""));
}
