NestJS Testing

About

Provides comprehensive guidance and implementation patterns for testing NestJS applications, ensuring functional correctness through specialized unit, integration, and e2e testing. It helps developers configure Jest environments, manage complex dependency injection mocking via TestingModule, and perform real HTTP route testing with Supertest. By following standard project layouts and naming conventions, it streamlines the creation of maintainable test suites for services, controllers, guards, and interceptors while offering specific strategies for handling authentication and database isolation.

Key Features

• Strategic dependency overriding and TypeORM repository mocking for isolated testing
• 1 GitHub stars
• Comprehensive unit testing for services, guards, pipes, and controllers with provider mocking
• Automated setup and optimization of Jest configuration for NestJS environments
• End-to-end (E2E) test implementation using Supertest to validate HTTP endpoints
• Troubleshooting guidance for common testing pitfalls like async failures and DI errors

Use Cases

• Adding unit tests for a new NestJS service or controller with mocked dependencies
• Setting up a full E2E testing environment with Supertest and custom Jest configs
• Refactoring existing tests to follow industry-standard NestJS testing patterns