unit-test-bean-validation

SKILL.md

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 (@NotNull, @Email, @Min, @Max, @Size), custom @Constraint 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 @Constraint validators and constraint violation messages

Testing bean validation logic in DTOs and request objects

Verifying cross-field validation (e.g., password matching)

Testing conditional validation with validation groups

Fast validation tests without Spring Boot context

Instructions