模拟pRetry函数中的计时器以进行测试

function pRetry(fn, options) {
  return new Promise((resolve, reject) => {
    const retry = (attempt) => {
      fn()
        .then(resolve)
        .catch((error) => {
          if (attempt >= options.maxAttempts) {
            reject(error);
          } else {
            const delay = options.delay * Math.pow(options.backoff, attempt);
            setTimeout(() => {
              retry(attempt + 1);
            }, delay);
          }
        });
    };

    retry(1);
  });
}

// 测试代码
jest.useFakeTimers(); // 使用Jest提供的模拟计时器功能

test('pRetry should retry with correct time intervals', () => {
  const mockFn = jest.fn();
  const options = {
    maxAttempts: 3,
    delay: 1000,
    backoff: 2,
  };

  pRetry(mockFn, options);

  expect(mockFn).toHaveBeenCalledTimes(1);

  jest.advanceTimersByTime(1000); // 快进时间，模拟第一次重试
  expect(mockFn).toHaveBeenCalledTimes(2);

  jest.advanceTimersByTime(2000); // 快进时间，模拟第二次重试
  expect(mockFn).toHaveBeenCalledTimes(3);

  jest.advanceTimersByTime(4000); // 快进时间，模拟第三次重试
  expect(mockFn).toHaveBeenCalledTimes(4);
});