describe("waitForever", () => {

it("creates an unref'ed interval and returns a pending promise", () => {

const setIntervalSpy = vi.spyOn(global, "setInterval");

const promise = waitForever();

expect(setIntervalSpy).toHaveBeenCalledWith(expect.any(Function), 1_000_000);

expect(promise).toBeInstanceOf(Promise);

setIntervalSpy.mockRestore();

const unref = vi.fn();

const interval = { unref } as unknown as ReturnType<typeof setInterval>;

const setIntervalSpy = vi.spyOn(global, "setInterval").mockReturnValue(interval);

try {

const promise = waitForever();

expect(setIntervalSpy).toHaveBeenCalledTimes(1);

const [callback, delay] = setIntervalSpy.mock.calls[0] ?? [];

expect(typeof callback).toBe("function");

expect(delay).toBe(1_000_000);

expect(unref).toHaveBeenCalledTimes(1);

expect(promise).toBeInstanceOf(Promise);

} finally {

setIntervalSpy.mockRestore();

}

});

});