Which strategies can be applied to test a Mendix application?

The answer highlighting unit testing, end-to-end testing, and performance testing reflects a comprehensive approach to ensure the quality and functionality of a Mendix application throughout its development lifecycle.

Unit testing involves testing individual components or functions of the application in isolation to verify that each part operates correctly. This is crucial for detecting bugs early in the development process and ensuring that the logic behind individual features performs as expected.

End-to-end testing assesses the complete flow of the application, ensuring that various components work together seamlessly. This type of testing mimics real user scenarios, providing confidence that the application will behave correctly when users interact with it in the actual environment.

Performance testing evaluates the application's responsiveness, stability, and scalability under a particular workload. This ensures that the app can handle expected user interactions without degradation in performance, which is essential for delivering a positive user experience.

The other options present limited or inappropriate testing strategies. Relying solely on manual testing may lead to oversight of issues that automated methods, like unit and performance testing, can catch more efficiently. Visual testing by users only lacks the rigorous methodology needed for comprehensive functional verification, and testing exclusively after deployment does not allow for early detection and remedy of issues, potentially resulting in costly fixes and user dissatisfaction. Thus, the correct answer