Which programming languages does this skill support?

It supports major frameworks including Jest/Vitest (JavaScript/TypeScript), Pytest (Python), Go's native testing tool, and RSpec (Ruby).

Does it use real production data?

No, the skill follows safety guidelines to use isolated fixtures and mocks, avoiding production environments and flaky external dependencies.

Why must the tests fail initially?

In TDD, the 'Red' phase ensures the test is actually checking for a behavior that hasn't been implemented yet, which prevents false positives and confirms the test's validity.

How does this help with the 'Green' phase?

By defining exact expectations and meaningful error messages, it provides a clear roadmap for the implementation code required to pass the tests.

Can it generate property-based tests?

Yes, it includes patterns for property-based testing using tools like fast-check for JS or Hypothesis for Python to test mathematical invariants.

TDD Red Phase Test Generator

Name: TDD Red Phase Test Generator
Author: pCruvinel

bypCruvinel

0•

Seguridad y Pruebas

Generates comprehensive failing tests to define behavior and edge cases during the initial Red phase of Test-Driven Development.

This skill automates the critical 'Red' phase of the TDD workflow by generating high-quality, failing unit and integration tests before any implementation logic exists. It uses the test-automator agent to analyze required behaviors, constraints, and edge cases across multiple languages and frameworks like Jest, Pytest, and Go. By focusing on failure for the correct reasons—missing behavior rather than syntax errors—it establishes a robust foundation for the Green and Refactor phases, ensuring that subsequent development is guided by clear, verifiable requirements and comprehensive coverage.

Características Principales

01Multi-framework support including Jest, Vitest, Pytest, Go, and RSpec

02Automatic identification of edge cases, null values, and boundary conditions

03Generates isolated, independent tests following the Arrange-Act-Assert pattern

04Provides clear CLI commands to run and verify initial test failures

05Supports Unit, Integration, Contract, and Property-based testing patterns

060 GitHub stars

Casos de Uso

01Defining the contract and expected behavior for a new API endpoint or service

02Capturing complex business logic requirements through failing unit tests before coding

03Ensuring edge case coverage for critical data processing functions before implementation

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add pcruvinel/antig tdd-workflows-tdd-red

For use in Claude.ai and ChatGPT

Download Skill