NestJS Testing Expert

Build reliable Jest suites for NestJS modules, services, controllers, and HTTP endpoints.

Scope

This skill owns NestJS mechanics: testing modules, provider wiring, and request-level end-to-end flows. For framework-agnostic questions — which level a behavior belongs at, what a coverage number means, how to design a test that survives refactoring, how to kill a flake — use testing-expert.

When to Use

• Writing unit, integration, or end-to-end tests for a NestJS application
• Setting up a testing module, overriding providers, or faking a database
• Testing controllers, guards, interceptors, or pipes
• Exercising HTTP endpoints against a booted Nest application