skill-testing-junit

To write unit tests in Spring Boot using JUnit 5 and Mockito, you apply focused unit testing patterns with Mockito mocks and proper verifications to isolate service behavior. This approach ensures reliable tests and fast feedback loops without needing the full application context.

The best way to structure integration tests for a Java Spring Boot application is to use Spring Boot Test slices like WebMvcTest alongside TestContainers. This strategy provides realistic integration scenarios and meaningful test coverage across your application layers.

You should use Spring Boot test slices instead of full integration tests when targeting specific application layers, such as web or persistence. Slices like WebMvcTest load only necessary components, enabling faster and more focused integration testing scenarios.

To manage test data consistency in JUnit 5 tests, you implement reusable test data builders and factories. These factories provide consistent test data across your unit and integration tests, maximizing reliability and reducing boilerplate setup.

Yes, JUnit 5 works seamlessly with Mockito to verify basic service behavior such as findById operations. You can quickly run a minimal JUnit 5 test with Mockito in a Spring Boot service to validate mock interactions and expected outputs.