public void Can_Not_Add_User_With_No_Email()
{
// Arrange .. instantiate the component under test
Mock<IUserRepository> mockRepo = new Mock<IUserRepository>();
_component = new UserComponent(mockRepo.Object);
// Arrange .. user object to be added
var user = new User();
user.DisplayName = "galilyou";
user.Url = @"http://galilyou.blogspot.com";
// Act ..
_component.Add(user);
// Assert .. verify the call to Add never happend
mockRepo.Verify(c=> c.Add(user), Times.Never());
}