public void GivenConfirmedUserWithUniqueEmailNullWhenUpdateUserThenMembershipCreateUserException(string providerName)
{
// arrange
var testClass = this.WithProvider(providerName);
var testUser = testClass.WithConfirmedUser().AsMembershipUser();
testUser.Email = null;
// act // assert
Assert.Throws<MembershipCreateUserException>(() => testClass.UpdateUser(testUser));
}