About
This skill equips Claude with specialized knowledge to navigate the significant testing changes introduced in Spring Boot 4, specifically the required migration from @MockBean to @MockitoBean. It provides expert guidance on selecting the right test slice (WebMvc, DataJpa, Json) to maximize test speed, implementing Testcontainers with the simplified @ServiceConnection API, and performing advanced verification with Spring Modulith's Scenario API. Whether you are upgrading a legacy suite or building a new reactive backend, this skill ensures your tests are idiomatic, secure, and maintainable.