Which frameworks does this skill support?

This skill is specifically optimized for TypeScript projects using NestJS and the Jest testing framework.

Does it handle database mocking?

Yes, it includes specialized patterns for mocking repositories and using in-memory databases like pg-mem and mongodb-memory-server.

How does it help with test performance?

It provides specific workflows for detecting open handles and optimizing Jest runtime configurations to significantly speed up test execution.

What is the AAA pattern mentioned in the skill?

It enforces the Arrange-Act-Assert pattern to ensure all unit tests are readable, maintainable, and follow a logically consistent structure.

TypeScript Unit Testing Professional

Name: TypeScript Unit Testing Professional
Author: bmad-labs

bybmad-labs

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Security & Testing

Streamlines the creation, debugging, and optimization of TypeScript and NestJS unit tests using Jest and industry-standard mocking patterns.

This skill provides a comprehensive framework for managing the full lifecycle of unit testing within TypeScript and NestJS environments. It leverages specialized tools like @golevelup/ts-jest for type-safe deep mocking and provides standardized workflows for setting up Jest configurations, writing Arrange-Act-Assert (AAA) tests for various NestJS components, and debugging flaky tests. By automating test generation and ensuring adherence to best practices, it helps developers maintain high code quality and coverage while minimizing the overhead of test maintenance.

Key Features

01Automated Jest and @nestjs/testing infrastructure configuration

021 GitHub stars

03Integrated support for in-memory databases like MongoDB and PostgreSQL

04Standardized AAA (Arrange-Act-Assert) pattern enforcement

05Advanced debugging for open handles and test performance optimization

06Deep mocking capabilities for NestJS services, controllers, and guards

Use Cases

01Increasing code coverage for complex business logic and edge cases

02Generating comprehensive test suites for new NestJS microservices

03Identifying and fixing memory leaks or open handles in slow test runs

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add bmad-labs/skills typescript-unit-testing

For use in Claude.ai and ChatGPT

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