如何在Jest酶中测试此嵌套函数

Question

我想以100％的覆盖率开玩笑地测试此功能。它是一个Javascript函数。它嵌套得很深，因此我无法了解如何覆盖每条语句进行测试

/**
 * Track the progress of a task from an intent response
 * @param {String} taskUuid - the response of the entity to track
 * @param {Number} [interval] - the polling interval to use (optional).
 * @param {Object} trigger - triggers to excecute fucnctions based on task status
 * @returns {Promise} promise that resolves when the task is completed.
 */
export function trackTaskProgress(taskUuid, interval, trigger) {
  return new Promise((resolve, reject) => {
    if (!TaskManager) {
      resolve();
      return;
    }
    TaskManager.trackTaskStatus(taskUuid, {
      intervalTime: interval || 5000,
      onTaskUpdate: (task) => {
        const completed = task.isTaskCompleted();
        if (!completed) {
          if (trigger && trigger.whileNotCompleted) {
            trigger.whileNotCompleted(task);
          }
        } else {
          const isFailed = (task.isStatusAborted() || task.isStatusFailed());
          if (isFailed) {
            if (trigger && trigger.whenFailed) {
              trigger.whenFailed(task);
            }
          } else {
            // eslint-disable-next-line no-lonely-if
            if (trigger && trigger.whenSuccess) {
              trigger.whenSuccess(task);
            }
          }
          resolve();
          return completed;
        }
      }
    });
  });
}

我已经尝试过编写如下的测试用例：

describe('ANCUtils', () => {
  describe('trackTaskProgress', () => {
    it('test triggerOptions to have been called', () => {
      AphroditeApi.Managers.TaskManager = {
        trackTaskStatus: jest.fn()
      };
      AphroditeApi.Managers.TaskManager.trackTaskStatus.mockImplementation((trigger) => {
        trigger.whileNotCompleted();
        trigger.whenFailed();
        trigger.whenSuccess();
      });
      AphroditeApi.Managers.TaskManager.trackTaskStatus(mockTriggerOptions);
      trackTaskProgress('a80166d2-8689-4850-b95a-209fd5e85712',
        1000, mockTriggerOptions);
      expect(mockTriggerOptions.whileNotCompleted).toHaveBeenCalled();
      expect(mockTriggerOptions.whenFailed).toHaveBeenCalled();
      expect(mockTriggerOptions.whenSuccess).toHaveBeenCalled();
    });
  });

但它甚至不能覆盖10％。附加覆盖率报告中的屏幕截图。 enter image description here