'Signature is not presented in signature reference data.'

def test_signature_validate_no_signature(self):

    access = self.blob['access']
    params = {'SignatureMethod': 'HmacSHA256', 'SignatureVersion': '2', 'AWSAccessKeyId': access}
    sig_ref = {'access': access, 'signature': None, 'host': 'foo:8080', 'verb': 'GET', 'path': '/bar', 'params': params}
    self.assertRaises(exception.Unauthorized, self.controller.check_signature, self.creds_ref, sig_ref)
