Sinon: 存根默认导出函数

模拟 ES 模块是一个常见的用例。

例如，我有一个导入 getEventByEventId 的模块

import getEventByEventId from '../queries/getEventByEventId';

export default async (
  {
    connection,
    session
  }: ResolverContextType
) => {
  if (!session || !session.userId) {
    throw new Error('User must be authenticated.');
  }

  const event = await getEventByEventId(connection, eventId);

  // ..
}

在我的测试中，我想模拟 getEventByEventId，例如

import test from 'ava';
import sinon from 'sinon';
import moment from 'moment';
import createReservation from '../../../src/mutators/createReservation';

test('throws an error if the event is in the past', async (t) => {
  const parameters: any = {};

  const context: any = {
    session: {
      userId: 1
    }
  };

  const stub = sinon.stub().returns({
    date: moment().format('YYYY-MM-DD'),
    time: moment(new Date().getTime() - 1000 * 60).format('HH:mm')
  });

  // How to use the stub to mock `getEventByEventId`?

  await t.throws(createReservation(context), 'Cannot create a reservation for a past event.');
});

这是之前在这里问过的： https : https :
这在那个问题中已经提到过，但它似乎不再受到关注。