def test_fullname_is_only_first_or_lastname_if_other_is_missing(self):
billy = User("billyj", firstname="billy")
self.assertEquals('billy', billy.fullname())
johnson = User("billyj", lastname="johnson")
self.assertEquals('johnson', johnson.fullname())
def test_fullname_is_userid_if_no_name_given(self):
billyj = User("billyj")
self.assertEquals('billyj', billyj.fullname())
def test_fullname_is_first_and_lastname(self):
billy = User("billyj", firstname="billy", lastname="johnson")
self.assertEquals('johnson billy', billy.fullname())
