Spring Boot Pre-Interview Guide Part 2: Database & Testing — Environment Split · Test Pyramid · Testcontainers
Environment-specific DB selection and ddl-auto policies, Memory Repository pitfalls, Test Pyramid annotation choices, choosing between test doubles (Dummy, Stub, Spy, Mock, Fake), and using Testcontainers to catch bugs that H2 dialect differences hide — the second most-flagged area in Spring Boot pre-interview submissions, covered in one post.
