'Generate and save a User and an LTI user model'

def create_lti_user_model(self):

    edx_user = User(username=self.edx_user_id)
    edx_user.save()
    lti_user = LtiUser(lti_consumer=self.lti_consumer, lti_user_id=self.lti_user_id, edx_user=edx_user)
    lti_user.save()
    return lti_user
