What testing patterns does this skill support?

The skill primarily supports the AAA (Arrange-Act-Assert) pattern and the Given-When-Then BDD style, specifically optimized for NestJS applications.

Is this skill limited to unit tests?

No, it follows the 'Test Pyramid' philosophy, providing guidance and scaffolding for Unit, Integration, and E2E tests.

Can it identify poor testing habits?

Yes, it includes guidance on avoiding anti-patterns such as testing private methods, over-mocking, and sharing state between tests.

Does it help with database integration testing?

Yes, it provides specific implementation patterns for Testcontainers, allowing you to run integration tests against real instances of PostgreSQL, Redis, and Kafka.

How does it handle NestJS dependency injection in tests?

It provides templates for the NestJS Testing Module, including type-safe mocking strategies for repositories and external services.

NestJS Test Patterns

Name: NestJS Test Patterns
Author: m16khb

bym16khb

0•

Security & Testing

Implements standardized NestJS testing architectures using AAA patterns, Testcontainers, and robust mocking strategies.

This skill enhances Claude's ability to design and implement high-quality testing suites specifically for NestJS environments. It provides deep domain expertise in the AAA (Arrange-Act-Assert) pattern, the test pyramid philosophy, and proper use of the NestJS Testing Module. By guiding the setup of unit, integration, and E2E tests—including containerized database testing with Testcontainers—this skill ensures that developers avoid common anti-patterns like excessive mocking or testing private implementation details. It is an essential tool for teams aiming for high reliability and maintainable codebases through structured automated testing.

Key Features

01Automated detection and prevention of common testing anti-patterns

02Standardized AAA and Given-When-Then pattern scaffolding

03Type-safe NestJS Testing Module and Mocking configuration

04Detailed coverage guidelines tailored for business logic and controllers

05Integration testing setup with Testcontainers for PostgreSQL and Redis

060 GitHub stars

Use Cases

01Configuring containerized integration tests for database-driven modules

02Scaffolding unit tests for complex NestJS services using Jest mocks

03Refactoring legacy test suites to follow modern AAA and BDD patterns

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add m16khb/cc-essential test-patterns

For use in Claude.ai and ChatGPT

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