Test NestJS services and controllers with Jest and Supertest.
npx skills add https://github.com/ngxtm/skill-rule --skill nestjs-testing-ngxtm
Please help me install this Agent Skill. Skill: NestJS Testing Source: https://github.com/ngxtm/skill-rule/tree/main/rules/nestjs/testing Command: npx skills add https://github.com/ngxtm/skill-rule --skill nestjs-testing-ngxtm
This Skill provides clear guidelines and best practices for implementing robust unit and end-to-end tests in NestJS applications, ensuring code quality and reliability.
Follow the NestJS testing standards to write unit tests for your services and E2E tests for your controllers.
High-intent search queries and answers about installing and using this skill.
Unit testing in NestJS involves isolating individual services using Jest mocks. This approach ensures dependencies are simulated, allowing you to test specific service logic without triggering external database interactions.
The best way to write E2E tests in NestJS is using Supertest with a Dockerized database. This method tests the full application lifecycle, including real database state management and controller integration.
Mocking for service isolation in NestJS replaces actual dependencies with simulated versions. This allows Jest to evaluate the service's internal logic independently, preventing external side effects during the test execution.
Docker is required to manage database state for full-lifecycle E2E tests in NestJS. Using a Dockerized database ensures a controlled, isolated environment for reliable integration and end-to-end testing.
Testing NestJS controller integration can be done without a real database by applying mocking patterns. However, using a Dockerized database is recommended for full-lifecycle E2E tests to ensure accurate database state management.
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