typescript-testinglisted

# Testing code that uses an APIMatic TypeScript SDK The SDK has **no mocking helpers**. Its transport is an axios client (`@apimatic/axios-client-adapter`), and the only injection point exposed on `Configuration` is **`unstable_httpClientOptions`** — passed straight through to that adapter as its axios config. Supplying a stub **axios adapter** there is the in-process seam: no network, no global patching. > `unstable_` means exactly that: it is an escape hatch, not a stable API, and may change between SDK > versions. If you would rather not depend on it, stub at the HTTP layer with `nock` (Node) or `msw` > instead — the assertions below apply either way. The samples below use Jest `test` + `expect` for reference only — mirror whatever the project already uses. ## A reusable stub helper ```typescript import { Client } from 'paypal-server-sdklib'; function clientReturning(status: number, body: unknown): { client: Client; requests: () => any[]; } { const requests: any[] = []; const client = new Client({ // Dummy credentials for whatever scheme the operation requires. Auth is applied BEFORE the // transport, so an unauthenticated stub client throws instead of reaching your adapter. // Copy the property name and its inner field names from the `Configuration` interface in // src/configuration.ts; prefer an API-key/basic scheme over an OAuth one. {apiKeyProperty}: { /* dummy values */ }, unstable_httpClientOptions: { // An axios adapter: