In this chapter, we focused on testing the Spring Boot backend. We used JUnit for testing and implemented test cases for JPA and RESTful web service authentication. We created one test case for our owner repository to verify that repository methods behave as expected. We also tested the authentication process by using our RESTful API. Remember that testing is an ongoing process throughout the development lifecycle. You should update and add tests to cover new features and changes when your application evolves.In the next chapter, we will set up the environment and tools related to frontend development.