'Verify that invalid email addresses return an error.'

def test_invalid_email_addresses(self):

    email_addresses = ['email@', '@email', 'invalid@email.']
    response_dict = self.request_add_users_to_cohort(','.join(email_addresses), self.cohort1, self.course)
    self.verify_added_users_to_cohort(response_dict, self.cohort1, self.course, expected_added=[], expected_changed=[], expected_present=[], expected_preassigned=[], expected_unknown=[], expected_invalid=email_addresses)
