Spring Boot Slice Testing

Apply Spring Boot slice testing guidelines.

What is covered in this Skill?

• @WebMvcTest for web layer
• @JdbcTest for repository layer
• @JsonTest for JSON serialization
• @MockBean for mocking dependencies
• Test profiles
• @TestConfiguration for custom setup

Scope: Apply recommendations based on the reference rules and good/bad code examples.

Constraints

Before applying any test changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.