Why use standalone MockMvc for these tests?

Standalone setup is significantly faster than @SpringBootTest because it only initializes the controller and the exception handler, allowing for rapid feedback loops during development.

Can I use this for security-related exceptions?

Absolutely. It includes patterns for testing Unauthorized (401) and Forbidden (403) status codes triggered by security-related exceptions or custom permission evaluators.

How does this skill help with Spring Boot testing?

It provides reusable patterns to test global exception handlers (@ControllerAdvice) using MockMvc standalone setup, ensuring your API error responses are correct without needing a full application context.

Does it support testing validation errors?

Yes, the skill includes specific patterns for testing MethodArgumentNotValidException to verify that field-level validation errors are correctly formatted in the JSON response.

Java Exception Handler Unit Tester

Name: Java Exception Handler Unit Tester
Author: giuseppe-trisciuoglio

bygiuseppe-trisciuoglio

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126

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Security & Testing

Streamlines the creation of unit tests for Spring Boot @ControllerAdvice and @ExceptionHandler methods using MockMvc.

The unit-test-exception-handler skill provides standardized patterns and best practices for testing global error handling in Java Spring Boot applications. By utilizing MockMvc standalone setups, it enables developers to verify exception-to-error-response transformations, HTTP status codes, and JSON error structures without the performance overhead of full integration tests. It is particularly useful for ensuring consistent API error contracts, validating field-level error messages in web forms, and testing custom business logic within exception handlers.

Key Features

01Validation error mapping and field-level error detail verification

02126 GitHub stars

03Standardized patterns for testing @ControllerAdvice and @ExceptionHandler

04Standalone MockMvc configuration for isolated exception handler testing

05Automated verification of HTTP status codes and @ResponseStatus mappings

06Reusable test controller templates for triggering specific exception types

Use Cases

01Validating that custom BusinessExceptions return the correct 4xx or 5xx status codes

02Ensuring REST API error responses match a specific JSON contract across an entire application

03Testing complex @ControllerAdvice logic involving message localization or side-effect logging

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add giuseppe-trisciuoglio/developer-kit unit-test-exception-handler

For use in Claude.ai and ChatGPT

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