How to create a custom express request to test with supertest

Question

I am trying to call a function from my app using supertest and sending a custom express request but I am getting a 422 Error when I send my request.

This is my custom express request

export interface CreateGroupRequest extends Request {
    body: {
        groupName: string;
        email: string;
        country: string;
    };

This is my mock request

                var testCreateGroupRequest: CreateGroupRequest = {
                   body: {
                        groupName: testName,
                        email: email,
                        country: 'US',
                    }
                } as Request

This is my test so far

 await supertest(app)
                .post("/login")
                .send(testLoginBody)
                .expect(200)
                .then((response) => {
                    sessionToken = response.body.token
                }).then(() => {
                    supertest(app)
                        .post("/create_group")
                        .set('X-JWT-Token', `${sessionToken}`)
                        .send(testCreateGroupRequest)
                        .then((response) => {
                             console.log({response})
                        })
                })

The message that is in the response is "body.groupName\" is required". How should I be creating the custom request?

Answer 1

Here's one of supertest 's examples:

describe('POST /users', function() {
  it('responds with json', function(done) {
    request(app)
      .post('/users')
      .send({name: 'john'})
      .set('Accept', 'application/json')
      .expect('Content-Type', /json/)
      .expect(200)
      .end(function(err, res) {
        if (err) return done(err);
        return done();
      });
  });
});

Notice that in their send method, they directly send the body . They don't extend or make their own Request .

So to fix your issue you just need to send the body and not the fake request:

supertest(app)
    .post("/create_group")
    .set('X-JWT-Token', `${sessionToken}`)
    .send({
        groupName: testName,
        email: email,
        country: 'US',
    })
    .set('Accept', 'application/json') // Don't forget the header for JSON!
    .then(console.log) // Shortened