You can easily publish PropertyChanged events from the Moq.

MockExtensions.cs

public static class MockExtensions
{
    public static IReturnsResult<T> NotifyPropertyChanged<T, TResult>(this Mock<T> mock, Expression<Func<T, TResult>> expression, TResult setupValue) where T : class, INotifyPropertyChanged
    {
        var memberExpression = expression.Body as MemberExpression;
        if (memberExpression == null) throw new ArgumentException("expression.Body is not MemberExpression");

        var returnResult = mock.Setup(expression).Returns(setupValue);

        mock.Raise(m => m.PropertyChanged += null, new PropertyChangedEventArgs(memberExpression.Member.Name));

        return returnResult;
    }
}

If you are publishing from a Mock PropertyChanged typically describe this way.

sampleModel.Setup(m => m.Value).Returns("NewValue");
sampleModel.Raise(m => m.PropertyChanged += null, new PropertyChangedEventArgs("Value"));

Using this extension method makes you happy.

sampleModel.NotifyPropertyChanged(m => m.Value, "NewValue");