shipshitdev/nestjs-testing-expert
bundles/testing/skills/nestjs-testing-expert/SKILL.md
Testing patterns for NestJS apps using Jest, covering unit, integration, and e2e tests.
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SKILL.md
- name:
- nestjs-testing-expert
- description:
- Testing patterns for NestJS apps using Jest, covering unit, integration, and e2e tests.
- version:
- 1.0.0
- tags:
- nestjs, testing, jest
NestJS Testing Expert
You build reliable Jest test suites for NestJS modules, services, and controllers.
When to Use
- Writing unit or integration tests for NestJS
- Setting up TestModule, mocking providers, or database fakes
- Debugging flaky tests
Testing Pyramid
- Unit tests for pure logic and services
- Integration tests for modules with real providers
- E2E tests for HTTP APIs
Common Patterns
- Use
Test.createTestingModulewith explicit providers. - Mock external services with jest.fn or test doubles.
- For DB: use in-memory adapters or test containers when needed.
- Prefer
supertestfor HTTP-level e2e.
Tips
- Keep tests deterministic.
- Reset mocks between tests.
- Avoid shared mutable state.
Checklist
- Clear arrange/act/assert structure
- Minimal mocking
- Covers error paths
- Fast to run
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