def METHOD_NAME(self):
    self.prepare_data()
    self.create_token()
    headers = self.create_basic_header(
        'introspect-client', 'introspect-secret'
    )
    rv = self.client.post('/oauth/introspect', data={
        'token': 'a1',
        'token_type_hint': 'access_token',
    }, headers=headers)
    self.assertEqual(rv.status_code, 200)
    resp = json.loads(rv.data)
    self.assertEqual(resp['client_id'], 'introspect-client')