Question

我正在尝试用Jest in Node测试一个async呼叫，如下所示：

   it('testing to sign up feature', async (done) => {
        await expect(request(app).post('/signUp', {body:{a:1, b:3}})).resolves.toBe('created successful')
    });

但是，它会引发此错误：

expect(received).resolves.toBe(expected) // Object.is equality

Expected: "created successful"
Received: {"header": {"connection": "close", "content-length": "18", "content-type": "text/html; charset=utf-8", "date": "Fri, 03 Jul 2020 09:35:39 GMT"}, "req": {"data": undefined, "headers": {"user-agent": "node-superagent/3.8.3"}, "method": "POST", "url": "http://127.0.0.1:53456/signUp"}, "status": 200, "text": "created successful"}

  70 | 
  71 |      it('testing to sign up feature', async (done) => {
> 72 |              await expect(request(app).post('/signUp', {body:{a:1, b:3}})).resolves.toBe('created successful')
     |

我不确定如何在text下模拟响应的resolves.toBe...

编辑
试过了

    const response = await request(app).post('/signUp', {body:{a:1, b:3}})
    expect(response).resolves.toEqual('created successful')

但这会导致相同的错误

以防万一。我的注册API如下：

 signUp(req, res) {
    log.info('User signed up request received');
    postRequest('/signUp', JSON.stringify(req.body)).then((resp) => {
        res.status("200").send(resp);
    });
}



 async function postRequest(path, param) {
    try {
         return await mockCall(path, param);
    } catch (err) {
        throw err;
    }
}



 function mockCall(path, param) {
        // A mimic
       const magicNumber = 2000;
        return new Promise((resolve) => {
            setTimeout(() => {
                resolve("created successful");
            }, magicNumber);
        });
}

Answer 1

request(app).post('/signUp', {body:{a:1, b:3}})是返回一个对象的承诺。您可以在.text而不是整个对象上声明：

it('testing to sign up feature', async (done) => {
  const response = await request(app).post('/signUp', {body:{a:1, b:3}})
  expect(response.text).toBe('created successful')
});

Answer 2

这就是我解决的方式。

it('testing to sign up feature', async (done) => {
        const f = await request(app)
            .post('/signUp')
            .send({body:{a:1, b:3}});
        expect(JSON.parse(f.text)).toEqual({ message: 'user created successfully', status: 200 });
        done();
    });

另外，值得注意的是我使用npm-nock模拟呼叫。

beforeEach(() => {
    nock(<url>)
    .post('/signUp')
    .reply(200, { message: 'user created successfully', status: 200})
 })

使用Jest进行异步/等待测试无法在Node js中运行

2 个答案: