'Call ``PATCH /policies/{policy_id}``.'

def test_update_policy(self):

    self.policy['blob'] = json.dumps({'data': uuid.uuid4().hex})
    r = self.patch(('/policies/%(policy_id)s' % {'policy_id': self.policy_id}), body={'policy': self.policy})
    self.assertValidPolicyResponse(r, self.policy)
