public async Task CreateTextMessage_Valid()
        {
            // Ararnge
            var controller = CreateController();
            var model      = new MockTextMessageModel().Valid();

            RendererShouldReturn <CreateTextMessageModel>(defaultSuccessReturnData);

            // Act
            var response = await controller.TextMessage(model);

            // Assert
            AssertIsOk(response);
        }
        public async Task CreateTextMessage_Invalid()
        {
            // Setup
            var controller = CreateController(modelStateInvalid: true);
            var model      = new MockTextMessageModel().Invalid();

            RendererShouldReturn <CreateTextMessageModel>();

            // Perform
            var response = await controller.TextMessage(model);

            // Assert
            AssertIsBadRequest(response);
        }