Unit Testing Jakarta Bean Validation Overview This skill provides executable patterns for unit testing Jakarta Bean Validation annotations and custom validators using JUnit 5. Covers built-in constraints ( , , , , ), custom implementations, cross-field validation, and validation groups. Tests run in isolation without Spring context. When to Use - Writing unit tests for Jakarta Bean Validation or JSR-380 constraints - Testing custom validators and constraint violation messages - Testing bean validation logic in DTOs and request objects - Verifying cross-field validation (e.g., password matchin…