我如何在测试（玩笑）中手动设置变量的值？

Question

app.test.js

---

我的笑话文件中包含以下代码：

'use strict';
const request = require('supertest');
const app = require('./app');

//https://stackoverflow.com/questions/1714786/query-string-encoding-of-a-javascript-object
function serialise (obj) {
    return Object.keys(obj).map(k => `${encodeURIComponent(k)}=${encodeURIComponent(obj[k])}`).join('&');
}
describe('Test other /', () => {
    test('POST /example succeeds (200 OK) if checkboxes are ticked', () => {
        const toSend = {
            check: 'Spiderman'
        };
        return request(app).post('/example')
             .send(serialise(toSend))
             .expect(200);
    });
});

到目前为止，该测试还不错，但是在此特定测试期间，我想将一个名为Identifier的变量（在我的node.js文件中）设置为等于1的值。如何通过玩笑来做到这一点？（我尝试开玩笑地阅读文档，并在SO上查看了类似的问题，但找不到更具体的答案）。

app.js

---

node.js / example POST路径：

app.post('/example', (req, res) => {
    var checked = req.body.check;
    var Identifier = req.app.get('identifier'); // Accessed like a global variable (value set in previous block of code).

    ...

});

Answer 1

您可以使用app.set(name, value)执行此操作。例如：

app.js：

const express = require('express');
const bodyParser = require('body-parser');
const app = express();

app.use(bodyParser.urlencoded({ extended: false }));
app.post('/example', (req, res) => {
  const checked = req.body.check;
  const Identifier = req.app.get('identifier');
  console.log('Identifier:', Identifier);
  res.sendStatus(200);
});

module.exports = app;

app.test.js：

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

function serialise(obj) {
  return Object.keys(obj)
    .map((k) => `${encodeURIComponent(k)}=${encodeURIComponent(obj[k])}`)
    .join('&');
}

describe('Test other /', () => {
  test('POST /example succeeds (200 OK) if checkboxes are ticked', () => {
    const toSend = {
      check: 'Spiderman',
    };
    return request(app).post('/example').send(serialise(toSend)).expect(200);
  });
  test('POST /example succeeds (200 OK) if Identifier is set', () => {
    const toSend = {
      check: 'Spiderman',
    };
    app.set('identifier', 1);
    return request(app).post('/example').send(serialise(toSend)).expect(200);
  });
});

综合测试结果：

 PASS  stackoverflow/61373586/app.test.js (12.805s)
  Test other /
    ✓ POST /example succeeds (200 OK) if checkboxes are ticked (159ms)
    ✓ POST /example succeeds (200 OK) if Identifier is set (9ms)

  console.log stackoverflow/61373586/app.js:9
    Identifier: undefined

  console.log stackoverflow/61373586/app.js:9
    Identifier: 1

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        14.642s