Unit testing the Viewmodel

Question

I am sort of new to TDD. I have started creating the properties I need on the view model as plain auto property.

public string Firstname { get; set; }
         


        

Answer 1

A test should fail unless the behavior it is testing is already implemented.

For testing property change notifications in my last attempt, I created a helper class that helped me write tests like this (It's in NUnit)

[Test]
public void NotifiesChangeIn_TogglePauseTooltip()
{
   var listener = new PropertyChangeListener(_mainViewModel);

   _mainViewModel.TogglePauseCommand.Execute(null);

   Assert.That(listener.HasReceivedChangeNotificationFor("TogglePauseTooltip"));
}