argIndex: number,

label: string,

) {

const call = mock.mock.calls.at(callIndex);

const call = mock.mock.calls[callIndex];

if (!call) {

throw new Error(`Expected mock call: ${label}`);

}

return call[argIndex];

}

function firstSystemEventCall(): Array<unknown> {

const call = enqueueSystemEventMock.mock.calls[0];

if (!call) {

throw new Error("expected system event call");

}

return call;

}

async function expectFailoverAttribution(

run: Promise<unknown>,

expected: { sessionId: string; lane: string },

).rejects.toThrow("produced no output");

expect(enqueueSystemEventMock).toHaveBeenCalledTimes(1);

const [notice, opts] = enqueueSystemEventMock.mock.calls.at(0) ?? [];

const [notice, opts] = firstSystemEventCall();

expect(String(notice)).toContain("produced no output");

expect(String(notice)).toContain("interactive input or an approval prompt");

expect(requireRecord(opts, "system event options").sessionKey).toBe("agent:main:main");