Master Hibernate and JPA with Spring Boot in 100 Steps - Step 65 - Testing the Spring Data JPA Repository with findByID.

The video tutorial covers the use of Spring Data Repository, focusing on setting up a test environment, writing and running unit tests, and understanding the Optional return type. It explains how to use assertions to validate test results and concludes with a summary and next steps. The tutorial emphasizes the ease of using Spring Data Repository without writing additional code, highlighting the built-in functionalities like findById.

How does the optional type help in checking the existence of a course in the repository?

What steps should be taken if a course with a given ID does not exist in the repository?