Unit testing that events are raised in C# (in order)

Question

I have some code that raises PropertyChanged events and I would like to be able to unit test that the events are being raised correctly.

The code that i

Answer 1

Based on this article, i have created this simple assertion helper :

private void AssertPropertyChanged(T instance, Action actionPropertySetter, string expectedPropertyName) where T : INotifyPropertyChanged
    {
        string actual = null;
        instance.PropertyChanged += delegate (object sender, PropertyChangedEventArgs e)
        {
            actual = e.PropertyName;
        };
        actionPropertySetter.Invoke(instance);
        Assert.IsNotNull(actual);
        Assert.AreEqual(propertyName, actual);
    }

With this method helper, the test becomes really simple.

[TestMethod()]
public void Event_UserName_PropertyChangedWillBeFired()
{
    var user = new User();
    AssertPropertyChanged(user, (x) => x.UserName = "Bob", "UserName");
}