Unit Testing ExceptionHandler and ControllerAdvice Overview This skill provides patterns for writing unit tests for Spring Boot exception handlers. It covers testing methods in classes using MockMvc, including HTTP status assertions, JSON response validation, field-level validation error testing, and mocking handler dependencies. When to Use - Writing unit tests for methods - Testing global exception handling - Validating REST API error response formatting - Mocking exceptions in controller tests - Testing field-level validation error responses - Asserting custom error payloads and HTTP statu…