async/await:

test('rejects to octopus', async () => {
  await expect(Promise.reject(new Error('octopus'))).rejects.toThrow('octopus');
});

没有async/await:

test('rejects to octopus', () => {
  // make sure to add a return statement
  return expect(Promise.reject(new Error('octopus'))).rejects.toThrow(
    'octopus',
  );
});