javascript - Jest + NodeJS 中的 super 测试，异步/等待

Question

我尝试用 Jest 测试我的 api。我想要更多的抽象，所以我创建了这个函数:

const tokensConfig = config.get('test.tokens');

function testIt(method = 'get', url = '/', statuses = [], body = {}) {
      const testNames = ['unauthorized', 'user', 'admin'];
      const tokens = [null, tokensConfig.user, tokensConfig.admin];
    
      for (let i = 0; i < testNames.length; i++) {
        test(testNames[i], async () => {
          const response = await request(app)
            [method](url)
            .set('Accept', 'application/json')
            .set('Authorization', tokens[i])
            .send(body);
          expect(response.statusCode).toBe(statuses[i]);
        });
      }
    }

在我运行的 test.js 文件中:

const config  = require('config');
const request = require('supertest');
const testIt  = require('./testIt');
const app     = require('../app');

// It's work
describe('get user by email', () => {
    testIt('get', '/users/get-by-email/user@test', [401, 403, 200]);
  });
  
// It's not work  
describe('delete user', async () => {
    const userByEmail = await request(app)
      .get('/users/get-by-email/user@test')
      .set('Accept', 'application/json')
      .set('Authorization', config.get('test.tokens.admin'));

    testIt('delete', `/users/${userByEmail._id}`, [401, 403, 200]);
  });

async/await 中的问题 - testIt 在请求用户之前运行。

如果我移动测试(或它)来描述函数 testIt 中的 block 并在测试中创建请求用户，它将起作用。但我想要更多的抽象(测试 block 对于许多测试来说非常大)

如何解决？

Answer 1

看起来你需要让 jest 知道 expect 是一个异步方法，带有 resolves。

以下是 Jest 文档中的示例代码:

// async/await can be used.
it('works with async/await', async () => {
  expect.assertions(1);
  const data = await user.getUserName(4);
  expect(data).toEqual('Mark');
});

// async/await can also be used with `.resolves`.
it('works with async/await and resolves', async () => {
  expect.assertions(1);
  await expect(user.getUserName(5)).resolves.toEqual('Paul');
});

https://facebook.github.io/jest/docs/en/tutorial-async.html#async-await