public void HtmlHelper_Should_Have_Gravatar_Extensions()
{
// Arrange
var mock = MockRepository.GenerateMock<IViewDataContainer>();
var html = new System.Web.Mvc.HtmlHelper(new ViewContext(), mock);
// Act
var result = html.Gravatar("[email protected]");
// Assert
Assert.IsInstanceOfType(result, typeof(Gravatar));
}