Spring Boot Testing Standards

Priority: P0

Implementation Guidelines

Test Strategy

• Unit First: Prioritize pure unit tests (Mockito) over Context tests.
• Slice Testing: Use @WebMvcTest (Controllers) and @DataJpaTest (Repos) to reduce build time.
• Integration: Use @SpringBootTest only for critical end-to-end flows.

Best Practices

• Real Infrastructure: Use Testcontainers for DB/Queues. Avoid H2/Embedded.
• Assertions: Use AssertJ (assertThat) over JUnit assertions.
• Isolation: Use @MockBean for downstream dependencies in Slice Tests.

Anti-Patterns

• Context Reloading: **No Dirty Contexts**: Avoid @MockBean in base classes.
• External Calls: **No network I/O**: Use WireMock.
• System Out: **No System.out**: Use assertions.

References

• Implementation Examples