Question

我正在用Jest编写HTTP测试。我故意向/order端点发送格式错误的请求。像这样：

const axios = require('axios');

describe('a request to the API POST /order', () => {
  test('with a correct body', () => {
    axios.post("http://localhost:3000/order", {})
    .catch(function (error) {
      expect(1+4).toBe(3);
    });
  });
});

捕获了错误，但是expect(1+4).toBe(3)并未使测试失败。无论如何，如果我将该块移动到catch语句之外，则它将成功失败。我该如何解决？

Answer 1

axios.post返回一个promise，表示您正在测试异步代码。从这个docs

Jest需要知道要测试的代码何时完成，然后才能继续进行另一个测试。笑话有几种处理方法。

const axios = require('axios');

describe('a request to the API POST /order', () => {
  test('with a correct body - 1', () => {
    return axios.post('http://localhost:3000/order', {}).catch(function(error) {
      expect(1 + 4).toBe(3);
    });
  });

  test('with a correct body - 2', done => {
    axios.post('http://localhost:3000/order', {}).catch(function(error) {
      expect(1 + 4).toBe(3);
      done();
    });
  });
});

现在，开玩笑会让您的测试失败。

 FAIL  src/stackoverflow/58828255/index.spec.ts (6.965s)
  a request to the API POST /order
    ✕ with a correct body - 1 (40ms)
    ✕ with a correct body - 2 (8ms)

  ● a request to the API POST /order › with a correct body - 1

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

    Expected: 3
    Received: 5

       6 |   test('with a correct body - 1', () => {
       7 |     return axios.post('http://localhost:3000/order', {}).catch(function(error) {
    >  8 |       expect(1 + 4).toBe(3);
         |                     ^
       9 |     });
      10 |   });
      11 | 

      at src/stackoverflow/58828255/index.spec.ts:8:21

  ● a request to the API POST /order › with a correct body - 2

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

    Expected: 3
    Received: 5

      12 |   test('with a correct body - 2', done => {
      13 |     axios.post('http://localhost:3000/order', {}).catch(function(error) {
    > 14 |       expect(1 + 4).toBe(3);
         |                     ^
      15 |       done();
      16 |     });
      17 |   });

      at src/stackoverflow/58828255/index.spec.ts:14:21

Test Suites: 1 failed, 1 total
Tests:       2 failed, 2 total
Snapshots:   0 total
Time:        7.974s

Expect子句应使测试测试失败（但这不会发生）

1 个答案: