How to test key and value of object using supertest module

Question

I have test code as below:

const mocha = require('mocha');
const describe = mocha.describe;
const it = mocha.it;
const chai = require('chai');
const request = require('supertest');

const app = require('../app.test');

chai.should();

describe('Get /histories', () => {
  it('should return 200 status code', done => {
    request(app)
      .get('/client/profile')
      .expect('Content-Type', /json/)
      .expect(200, done);
  });

  it('should return code: 400', done => {
    request(app)
      .get('/client/profile')
      .expect('Content-Type', /json/)
      .expect(200)
      .expect(res => {});
  });
});

And I respond with a custom status code using Express:

return res.json({
    code: 400
})

Therefore I want to test that test code has code as key of object and the value is 400 as number.

How can I write this test?

Did you try using the `res`ponse in that last `.expect` callback? — jonrsharpe, Jun 26 '20 at 11:16
@jonrsharpe Nope, I m newbie as unit tester. Could you wirte some code for me? — Thomas Jason, Jun 26 '20 at 11:17
No, SO isn't a code-writing service. Look at the Supertest docs, they have examples of assertions on responses. — jonrsharpe, Jun 26 '20 at 11:17

score 1 · Accepted Answer · answered Jun 26 '20 at 11:19

You could use this:

it('should return code: 400', (done) => {
  request(app)
    .get('/client/profile')
    .expect('Content-Type', /json/)
    .expect(200)
    .end((err, res) => {
      if (err) {
        return done(err);
      }
      expect(res.code).to.be.equal(400);
      return done();
    });
});

score 0 · Answer 2 · answered Jun 26 '20 at 11:18

I think this is what you are looking for. Let me know if you need more information.

it('should return code: 400', async (done) => {
    var resp = await request(app)
      .get('/client/profile')
      expect(resp.statusCode).to.equal(400)
      expect(resp.body.code).to.equal(400)
  });

resp.statusCode is the http response code. resp.body is the response body. As that is a json, the response json of will have code.

How to test key and value of object using supertest module

2 Answers2