Which test runner is supported by this skill?

This skill is specifically designed for 'bun test', utilizing its Jest-compatible API to provide a high-performance testing environment.

What is the benefit of mutation testing in this workflow?

Mutation testing acts as a secondary quality gate by introducing small bugs (mutants) into your code to see if your tests catch them, ensuring your assertions are actually effective.

Why does this skill mandate the use of fake timers?

Real timers are slow, non-deterministic, and prone to race conditions. Fake timers allow tests to run instantly and reliably by giving the developer precise control over the progression of time.

How does this skill handle test concurrency issues?

Because fake timers involve global state, this skill provides patterns such as 'describe.sequential' to ensure timer-dependent tests do not interfere with one another.

JavaScript Testing Standards

Name: JavaScript Testing Standards
Author: hughescr

byhughescr

•

Security & Testing

Enforces rigorous standards for JavaScript and TypeScript testing using Bun Test, fake timers, and mutation testing quality gates.

This skill provides a comprehensive framework for writing high-quality JavaScript and TypeScript tests, specifically tailored for the Bun runtime environment. It establishes mandatory patterns for handling time-dependent code through fake timers to eliminate flakiness and non-determinism. Additionally, it integrates mutation testing as a secondary quality gate, ensuring that test suites are not just covering lines of code, but are actually capable of detecting defects through strong assertions and edge-case coverage.

Key Features

01Standardized implementation of Bun Test with Jest-compatible APIs

02Mutation testing integration to verify assertion strength and test quality

03Mandatory fake timer patterns for deterministic asynchronous testing

04Pre-defined patterns for testing debouncing, intervals, and system dates

05Sequential execution strategies to prevent timer-related state leakage

061 GitHub stars

Use Cases

01Implementing mutation testing as a final quality gate to ensure high test effectiveness

02Writing reliable unit tests for complex asynchronous logic and time-sensitive functions

03Refactoring flaky test suites to use deterministic fake timers and sequential execution

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add hughescr/claude-code-config testing-standards

For use in Claude.ai and ChatGPT

Download Skill