Individual skill

fastify-inject-testing

Use when asked to test Fastify applications without network sockets. Not for building the app: use fastify-schema-first-service.

.devin/skills/fastify-inject-testing/SKILL.md

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# Fastify inject testing

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Testing Fastify applications without network sockets: auth, validation errors, uploads, streams, plugins, hooks. |
| Authority | Reversible local: write only test files under the project test tree and run node:test suites. Roll back by deleting the added test files and reverting test-only config; never mutate application source, credentials, or remote state. |
| Side effect | Writes test files; runs node:test suites. |
| Done | Integration tests exercise routes via inject() with no listener, covering auth, validation failure, and at least one stream/upload path, passing in parallel. |

## Inputs

- A Fastify application factory (e.g. `buildApp()` or `buildTestApp(options)`) that returns a ready `FastifyInstance` without calling `listen()`. Required.