Dynamic port assignment in Fastify v4: test isolation when reusing instances
Goal Use Fastify’s inject method to run credential‑free integration tests while relying on dynamic port assignment ({ port: 0 }) to avoid hard‑coded ports and port collisions. Uncertainty After a test calls fastify.listen({ port: 0 }) and later fastify.close(), it is not fully clear whether the internal server address, plugin decorators, and encapsulation bo
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