How does it handle test coverage?

It provides a standardized configuration for jest.config.js to set global and folder-specific coverage thresholds for lines, branches, functions, and statements.

Can it help with testing asynchronous Node.js code?

Absolutely. The skill provides patterns for async/await tests, handling promise rejections, and using fake timers to test time-dependent logic without waiting for real-world delays.

Does this skill support mocking external dependencies?

Yes, it includes detailed patterns for both full module mocking using jest.mock() and partial spying using jest.spyOn() to isolate the code under test.

What is the AAA pattern in this skill?

AAA stands for Arrange, Act, and Assert. It is a standard pattern for structuring tests to ensure they are readable, maintainable, and clearly separate setup from execution and verification.

What are the common anti-patterns this skill helps avoid?

It helps prevent testing internal implementation details, using meaningless assertions like toBeDefined(), and writing vague test titles that don't describe the business scenario.

Jest Unit Testing Patterns

Name: Jest Unit Testing Patterns
Author: chavangorakh1999

bychavangorakh1999

0•

セキュリティとテスト

Standardizes JavaScript and Node.js unit testing using Jest patterns including AAA structure, mocking, and coverage thresholds.

This skill empowers Claude to write robust, maintainable unit tests for JavaScript and Node.js applications using the Jest framework. It enforces industry-standard practices like the AAA (Arrange-Act-Assert) pattern, provides comprehensive guidance on module mocking and spying, and assists in configuring coverage thresholds for critical modules. Whether you are generating new test suites, improving existing ones, or debugging complex asynchronous logic, this skill ensures your test code follows best practices while avoiding common anti-patterns like testing internal implementation details instead of behavior.

主な機能

01Handles complex asynchronous tests and fake timers for TTL logic

02Implements the AAA (Arrange-Act-Assert) pattern for test clarity

03Generates parameterized tests using test.each for data-driven scenarios

04Provides templates for module mocking and partial spying

05Identifies and corrects testing anti-patterns to improve suite quality

060 GitHub stars

ユースケース

01Writing new test suites for complex business logic in Node.js services

02Refactoring brittle tests to focus on behavior rather than implementation

03Setting up Jest configuration with custom coverage gates for CI/CD pipelines

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add chavangorakh1999/sde-skills unit-testing

For use in Claude.ai and ChatGPT

主な機能

01Handles complex asynchronous tests and fake timers for TTL logic

02Implements the AAA (Arrange-Act-Assert) pattern for test clarity

03Generates parameterized tests using test.each for data-driven scenarios

04Provides templates for module mocking and partial spying

05Identifies and corrects testing anti-patterns to improve suite quality

060 GitHub stars

ユースケース

01Writing new test suites for complex business logic in Node.js services

02Refactoring brittle tests to focus on behavior rather than implementation

03Setting up Jest configuration with custom coverage gates for CI/CD pipelines

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add chavangorakh1999/sde-skills unit-testing

For use in Claude.ai and ChatGPT