'Call ``PATCH /projects/{project_id}``.'

def test_update_project_parent_id(self):

    projects = self._create_projects_hierarchy()
    leaf_project = projects[1]['project']
    leaf_project['parent_id'] = None
    self.patch(('/projects/%(project_id)s' % {'project_id': leaf_project['id']}), body={'project': leaf_project}, expected_status=http_client.FORBIDDEN)
