how to test async function in jest code example

Example 1: jest test tothrow on an async function

it('should test async errors', async () =>  {        
    await expect(failingAsyncTest())
    .rejects
    .toThrow('I should fail');
});

Example 2: jest always pass async await

test.only("should not pass", async (done) => {
    try {
      const a = await getAsync()
      expect(a).toEqual(2)
      done()
    } catch (e) {
      // have to manually handle the failed test with "done.fail"
      done.fail(e)
    }
  })