RESTful CRUD application API Unit Tests

So I am trying to learn TDD/BDD with Javascript. I am creating a simple RESTful web app that uses GET, POST, PUT, and DELETE API calls to update data in a MongoDB database, and wanted to see if there was anything I can do to improve on the unit test I wrote. Both to make them more organized in the testing output, and to include more specific details that might be important from a testing standpoint.

The web app is built using the MEAN stack.

var superagent = require("superagent");
var chai = require("chai");
var mocha = require("mocha");
var should = require("should");
var expect = chai.expect;
var chaiHttp = require('chai-http');
var request = require("request");

var app = require('../app');

var mongoose = require("mongoose");
var campaign = require("../app_api/models/campaigns");




chai.use(chaiHttp);

describe("Campaign API Calls", function() {

    var test_id = 0;
    var test_campaign_name = "New_Tester_Campaign";

    describe("/POST/api/campaigns", function() {
        it("should create new campaign with valid input", (done) => {
            var campaign = {
                campaignName: test_campaign_name,
                campaignStatus: "active"
            }
            chai.request(app)
                .post('/api/campaigns')
                .send(campaign)
                .end((err, res) => {
                    res.status.should.be.equal(201);
                    res.body.should.be.type('object');
                    res.body.should.have.property('campaignName').eql(test_campaign_name);
                    res.body.should.have.property('campaignStatus');
                    res.body.should.have.property('_id');
                    test_id = res.body._id;  // Store ID of campaign for use by remaining tests
                done();
                });
        });
        it("should not create a new campaign with invalid input", (done) => {
            var campaign = {
                campaignName: "",
                campaignStatus: "active"
            }
            chai.request(app)
                .post('/api/campaigns')
                .send(campaign)
                .end((err, res) => {
                    res.status.should.be.equal(400);
                    res.body.should.have.property('message').eql('Campaign Name is Required');
                done();
                });
        });
    });

    describe("/GET/api/campaigns", function() {
        it("it should returns a list of campaigns", (done) => {
            chai.request(app)
                .get('/api/campaigns')
                .end((err, res) => {
                    res.status.should.be.equal(200);
                    res.body.should.be.type('object');
                done();
                });
        });
    });

    describe("/GET/api/campaigns/:campaignid", function () {
        it("it should GET the details of one campaign", (done) => {
            chai.request(app)
                .get('/api/campaigns/' + test_id)
                .end((err, res) => {
                    res.status.should.be.equal(200);
                    res.body.should.have.property('campaignName').eql(test_campaign_name);
                    res.body.should.have.property('_id').eql(test_id);
                done();
                });
        });
    });

    describe("/PUT/api/campaigns/:campaignid", function () {
        it("it should update a single campaign", (done) => {
            chai.request(app)
                .put('/api/campaign/' + test_id)
                .field('campaignName', 'Tester_Campaign')
                .end((err, res) => {
                    res.status.should.be.equal(200);
                    res.body.should.have.property('campaignName')
                        .eql('Tester_Campaign');
                don();
                });
        });
    });

    describe("/DELETE/api/campaigns/:campaignid", function() {
        it("it should delete a single campaign", function() {
            chai.request(app)
                .delete('/api/campaign/' + test_id)
                .end((err, res) => {
                    res.status.should.be.equal(200);
                    res.body.should.have.property('message')
                        .eql('Campaign successfully deleted');
                done();
                });
        });
    });
});