How do I run the tests generated by jit-catch?

The generated tests use the @moduletag :catching attribute. You can run them specifically using the command 'mix test --only catching'.

What is a catching test in Elixir?

A catching test is an ExUnit test designed to fail if a proposed code change introduces an unintended behavioral regression. It asserts that the parent behavior still holds true despite the new code.

Does this skill modify my production code?

No, jit-catch only reads your production code to analyze risks and generates new test files in your project's test directory.

What specific Elixir risks does this skill identify?

It scans for pattern match failures, missing function clauses for edge cases, broken pipe chains due to return type changes, and GenServer state corruption.

Can jit-catch be used with any version of Elixir?

Yes, it generates standard ExUnit code that is compatible with modern Elixir projects and follows community best practices for testing.

Elixir JIT Catching Test Generator

Name: Elixir JIT Catching Test Generator
Author: robmadole

byrobmadole

0•

安全与测试

Generates targeted ExUnit tests for Elixir code changes to catch unintended behavioral regressions before they are merged.

The jit-catch skill implements 'Just-in-Time Catching Test Generation' principles specifically for the Elixir ecosystem. By analyzing your active git diff, the skill identifies high-risk changes such as pattern match gaps, broken pipe chains, and GenServer state shifts. It then generates a suite of catching tests designed to assert pre-change behavior against your new implementation. This 'dodgy diff' approach helps developers surface subtle bugs, verify intent, and maintain system stability during refactoring or feature development.

主要功能

01Suspicious pattern detection based on industrial true-positive signals

02Automated git diff analysis of Elixir modules and function clauses

03Generation of idiomatic ExUnit tests with centralized catching tags

04Identification of Elixir-specific risks like FunctionClauseErrors and pipe breaks

05Plain-language sense checks to verify architectural intent with the user

060 GitHub stars

使用场景

01Performing a final automated bug-check on a feature branch before opening a pull request

02Verifying that a complex refactor of an Elixir pipeline hasn't altered return types

03Generating regression tests for mission-critical GenServer state changes

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add robmadole/agent-tools jit-catch

For use in Claude.ai and ChatGPT