Mockito
Java object mocking, method invocation verification, stubbing behavior, and isolated component testing.
1 / Java Mocking
Mockito provided object mocking and method verification for isolated unit testing in Java applications. In Spring Boot service tests, Mockito mocks replaced database repositories, external API clients, and authentication services — testing business logic without real infrastructure dependencies.
2 / Verification Patterns
Beyond basic stubbing, Mockito's verification capabilities — confirming that specific methods were called with expected arguments, in expected order — were useful for testing side-effect-producing code like event publishers and audit loggers. The `verify()` assertions caught cases where business logic correctly computed results but failed to trigger required downstream operations.
3 / Honest Scope
Mockito is a tool I use regularly but would not describe as a specialization. Its value is practical: it enables isolated component testing in Java applications by replacing dependencies with controlled substitutes.