File server_functions_spec.js

tests/unit/functions/server_functions_spec.js:None–None

// Tests use vi.spyOn on shared module objects (dns, undici).
// vi.spyOn modifies the object property directly on the cached module instance, so it
// is intercepted by server_functions.js regardless of the Module.prototype.require override
// in vitest-setup.js.  restoreAllMocks:true auto-restores spies, but may reuse the same