Why Intergation Test and Not Unit Test ?

• Unit Tests : Not ideal for testing Spring Data repositories because they require mocking many JPA components, which can disrupt the repository’s functionality.

• Integration Tests : Better suited for testing repositories. These tests check if queries retrieve the correct data from the database and ensure that operations like INSERT, UPDATE and DELETE work as expected.

@DataJpaTest Annotation

• Used to test repositories.

• Automatically configures Spring Boot settings to mimic real application behavior.

• Scans @Entity classes and configures Spring Data JPA repositories.

• Logs database queries for clarity.

TestEntityManager

• Used to interact with the database directly in tests.

• Helps populate tst data or veify results.

Example

the github link : Go to Github Repository