namespace NUnit.Framework
{
    public static class AssertionHelpers
    {
        public static void WithMessage(this Exception ex,string expectedMessage)
        {
            Assert.AreEqual(ex.Message, expectedMessage);           
        }
    }
}

// Extension method for retrieving a page from a PageReference
// For example:
// PageData parent = CurrentPage.ParentLink.GetPage()
public static PageData GetPage(this PageReference link)
{
    if (link==PageReference.EmptyReference)
        return null;
 
    return DataFactory.Instance.GetPage(link);
}