Just two extension methods I wrote in order to simplify testing of classes that implement INotifyPropertyChanged.
The first one just checks that the PropertyChanged event fires once and for the specified property:
/// <summary>
/// Checks whether a given action produces a change event for
/// a given property.
/// </summary>
/// <typeparam name=”T”>A class that implements <see cref=”INotifyPropertyChanged”/>.
/// </typeparam>
/// <param [...]