mock-module

What problem does it solve?

Improper mocking of Node.js built-in modules in test suites causes cross-test pollution, leading to flaky, unreliable test results that waste developer time and break CI/CD pipelines.

Core Features & Use Cases

• Enforces spreading real module exports when mocking Node.js built-ins to isolate test environments
• Eliminates state leakage between test cases that causes inconsistent, hard-to-debug test failures
• Use Case: When writing unit tests for a Node.js app that uses the fs or path built-in modules, this skill ensures your mocks don't leak state between test runs, so every test produces consistent, reliable results.

Quick Start

Use the mock-module skill to properly mock the Node.js fs built-in module in your test suite without causing cross-test pollution.