Master Hibernate and JPA with Spring Boot in 100 Steps - Step 1: What is JUnit and Unit Testing?

The video introduces unit testing, explaining its purpose in ensuring application functionality. It differentiates unit testing from screen testing, emphasizing testing specific methods or classes. The JUnit framework is introduced as a tool for automating unit tests, allowing for frequent and automated testing. The video highlights the advantages of automated unit testing, such as continuous integration, which ensures tests run whenever code changes occur.

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