Javascript 从“返回承诺”；描述；不支持。测试必须同步定义

特定的测试通过了，但我得到了这个

    console.log node_modules/jest-jasmine2/build/jasmine/Env.js:502
          ● 

Test suite failed to run

            Returning a Promise from "describe" is not supported. Tests must be defined synchronously.
            Returning a value from "describe" will fail the test in a future version of Jest.

        > 4 | describe('handlers.getSemesters', async () => {

下面是完整的测试代码

describe('handlers.getSemesters', async () => {
      it('should return an array of Semesters', async () => {
        academicCalendarRequest.request = jest.fn();
        academicCalendarRequest.request.mockReturnValue([
          {
            description: 'Semester1',
          }
        ]);
        const expected = [      
          {
            description: 'Semester1',
          },
        ];

        const handlers = new Handlers();
        const actual = await handlers.getSemesters();
        expect(actual).toEqual(expected);
      });
    });

如何修复它？

更改

describe('handlers.getSemesters', async () => {

到

然后将异步代码放入

it

块中

it('should return an array of Semesters', async () => {
  // ...
})

---

En解释他为什么应该这样做会很好。文档提供了有关定义异步测试的更多信息：

it('should return an array of Semesters', async () => {
  // ...
})