const { res, setHeader } = makeMockHttpResponse();

// Ensure flushHeaders is not defined on the mock response.

expect((res as unknown as { flushHeaders?: () => void }).flushHeaders).toBeUndefined();

expect(() => setSseHeaders(res)).not.toThrow();

setSseHeaders(res);

expect(setHeader).toHaveBeenCalledWith("Content-Type", "text/event-stream; charset=utf-8");

});

});

const { req, res } = buildReqRes(null, null);

const controller = new AbortController();

const cleanup = watchClientDisconnect(req, res, controller);

expect(() => cleanup()).not.toThrow();

cleanup();

expect(controller.signal.aborted).toBe(false);

});