Updated send user code to use an optional to field to send emails

Added tests for send_user_code

tests/app/conftest.py

@@ -151,3 +151,30 @@ def sample_admin_service_id(notify_db, notify_db_session):
     api_key = ApiKey(**data)
     save_model_api_key(api_key)
     return admin_service.id
+
+
+@pytest.fixture(scope='function')
+def mock_notify_client_send_sms(mocker):
+    def _send(mobile_number, message):
+        pass
+
+    mock_class = mocker.patch('app.notify_alpha_client.send_sms', side_effect=_send)
+    return mock_class
+
+
+@pytest.fixture(scope='function')
+def mock_notify_client_send_email(mocker):
+    def _send(email_address, message, from_address, subject):
+        pass
+
+    mock_class = mocker.patch('app.notify_alpha_client.send_email', side_effect=_send)
+    return mock_class
+
+
+@pytest.fixture(scope='function')
+def mock_secret_code(mocker):
+    def _create():
+        return '11111'
+
+    mock_class = mocker.patch('app.dao.users_dao.create_secret_code', side_effect=_create)
+    return mock_class