get 422 when post method

const { expect } = require('chai');
const chai = require('chai');
chai.use(require('chai-json-schema'));
chaiHttp = require('chai-http');
chai.use(chaiHttp);
var request = require('supertest');

var app = 'https://dev.sg.api.bcidata.net';

describe('POST /login', function() {
it.only('responds with json', function(done) {
request(app)
.post('/user/login')
.send({username: 'ihdisetiawan', password: 'testing123'})
.set('Accept', 'application/json')
.set('x-api-key', '1234567890')
.expect('Content-Type', /json/)
.expect(200)
.end(function(err, res) {
if (err) return done(err);
done();
});
});
});

1) POST /users
responds with json:
Error: expected 200 "OK", got 422 "Unprocessable Entity"