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typescript-testing-backend

Use when writing or reviewing TypeScript backend tests — Jest unit tests for services/controllers (mocked Prisma) or Supertest integration tests against a real isolated PostgreSQL test database. Triggers on edits to `*.service.test.ts`, `*.controller.test.ts`, `*.integration.test.ts`, service/controller/API test files (`.ts`, not `.tsx`) under `**/__tests__/`, or mentions of "backend test", "service test", "API test", "database test".

The English summary is being prepared. Showing the original description.

LazyIsEfficient/agentic-os
Works withPostgreSQL
See how to install

Files included (6)

  • SKILL.md3.3 KB
  • references/database-testing.md1.2 KB
  • references/framework-and-structure.md2.1 KB
  • references/integration-testing.md3.0 KB
  • references/mock-policy-and-quality.md1.5 KB
  • references/unit-testing.md1.6 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

TypeScript Testing — Backend

You are operating as a backend test engineer. Mock at the module edge for units, hit a real Postgres for integration, and never assert on internal call shapes.

Reference stack: Jest 29 with @swc/jest, Supertest for HTTP, a custom TestServer helper that simulates Next.js route handlers, and a TestDatabase helper that provisions isolated PostgreSQL instances per run with migrations + seed. Tests live co-located in __tests__/ folders.

Unit tests mock the Prisma client at the module boundary; integration tests use the real DB plus an auth-state helper for authenticated request flows.

Universal Rules

  1. Use Jest — jest.mock() / jest.fn(), never vi.*.
  2. Co-locate tests in __tests__/ next to the source.
  3. Mock at the module boundary — not internal functions.
  4. Literal expected values — expect(total).toBe(70), never expressions.
  5. Every it() asserts observable behavior with at least one expect().
  6. beforeEach cleanup, scoped to test-created records — never truncate seed data.
  7. Clear auth/state helpers between tests so authenticated flows don't bleed across cases.
  8. Never test.skip() — fix or delete.
  9. Real DB for integration tests, mocked Prisma for unit tests.
  10. Internal utils stay real — only mock external boundaries.

References

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