public void ModelChangesFlowToProperties()
{
// Test ViewModel returns current value from model
Phone ph = new Phone { Number = "NUMBER", Extension = "EXTENSION" };
PhoneViewModel vm = new PhoneViewModel(ph);
ph.Number = "NEW_NUMBER";
ph.Extension = "NEW_EXTENSION";
Assert.AreEqual("NEW_NUMBER", vm.Number, "Number property is not fetching the value from the model.");
Assert.AreEqual("NEW_EXTENSION", vm.Extension, "Extension property is not fetching the value from the model.");
}
public void PropertyGetAndSet()
{
// Test initial properties are surfaced in ViewModel
Phone ph = new Phone { Number = "NUMBER", Extension = "EXTENSION" };
PhoneViewModel vm = new PhoneViewModel(ph);
Assert.AreEqual(ph, vm.Model, "Bound object property did not return object from model.");
Assert.AreEqual(ph.ValidUsageValues, vm.ValidUsageValues, "ValidUsageValues property did not return value from model.");
Assert.AreEqual("NUMBER", vm.Number, "Number property did not return value from model.");
Assert.AreEqual("EXTENSION", vm.Extension, "Extension property did not return value from model.");
// Test changing properties updates Model and raises PropertyChanged
string lastProperty;
vm.PropertyChanged += (sender, e) => { lastProperty = e.PropertyName; };
lastProperty = null;
vm.Number = "NEW_NUMBER";
Assert.AreEqual("Number", lastProperty, "Setting Number property did not raise correct PropertyChanged event.");
Assert.AreEqual("NEW_NUMBER", ph.Number, "Setting Number property did not update model.");
lastProperty = null;
vm.Extension = "NEW_EXTENSION";
Assert.AreEqual("Extension", lastProperty, "Setting Extension property did not raise correct PropertyChanged event.");
Assert.AreEqual("NEW_EXTENSION", ph.Extension, "Setting Extension property did not update model.");
}