def test_cancel_dms_request(self, req_mock):
req_class = Mock()
req_class.executeRequest.return_value = None
req_mock.return_value = req_class
gate_client = GateClient('https://www.payment-api.com', 'AAAA-AAAA-AAAA-AAAA', '111')
initial_data = {
'init_transaction_id': '123123',
'amount_to_refund': '1000'}
result_data = gate_client.cancel_dms(initial_data)
expected_data = initial_data
expected_data['guid'] = 'AAAA-AAAA-AAAA-AAAA'
expected_data['account_guid'] = 'AAAA-AAAA-AAAA-AAAA'
expected_data['pwd'] = hashlib.sha1('111').hexdigest()
req_class.executeRequest.assert_called_once_with('cancel_dms', expected_data)
