return { baseUrl: `http://127.0.0.1:${port}/v1`, done, donePromise };

}

function requireFirstErrorArg(mock: ReturnType<typeof vi.fn>, label: string): Error {

const [call] = mock.mock.calls;

if (!call || !(call[0] instanceof Error)) {

throw new Error(`expected ${label}`);

}

return call[0];

}

describe("xai realtime transcription provider", () => {

it("normalizes provider config for voice-call streaming", () => {

const provider = buildXaiRealtimeTranscriptionProvider();

await expect(session.connect()).rejects.toThrow("Streaming ASR unavailable");

expect(session.isConnected()).toBe(false);

const error = onError.mock.calls[0]?.[0];

expect(error).toBeInstanceOf(Error);

const error = requireFirstErrorArg(onError, "xAI realtime setup error callback");

expect(error.message).toBe("Streaming ASR unavailable");

});