How to test a post request for fetching the result in javascript using jest & supertest?

<pre>'use strict'

jest.mock('../../utils/db2.js')
const request = require('supertest')
const executeDb2Query = require('../../utils/db2.js')
const app = require('../../app')

describe('service read API test', () => {
  beforeEach(() => {
    jest.resetModules()
  })
  
  it('check details Good', async () => {
    executeDb2Query.mockImplementation(() =>
      Promise.resolve([
        {
          dnum: '090703',
          num: 1,
          startdate: '2021-06-01',
          enddate: '2022-05-31',
          rolecode: 5,
          fnum: 1.049,
          lastmodifieddate: '2021-06-02 05:34:04.382279',
          createtime: '2021-06-01 10:53:24.269686'
        }
      ])
    )
    await request(app)
      .post('/api/v1/abc/xyz')
      .send({
        id: '090703'
      })
      // .expect('Content-Type', /json/)
      .expect(200)
      .then(res => {
        console.log('Response Body :', JSON.stringify(res.body, null, 2))
        expect(res.body).toEqual({
          dnum: '090703',
          num: 1,
          startdate: '2021-06-01',
          enddate: '2022-05-31',
          rolecode: 5,
          fnum: 1.049,
          lastmodifieddate: '2021-06-02 05:34:04.382279',
          createtime: '2021-06-01 10:53:24.269686'
   
      })
  })
})

● Console

    console.log
      Response Body : [
        {}
      ]

      at __tests__/routes/details.test.js:84:17

  ● service read API test › check details Good

    expect(received).toEqual(expected) // deep equality

    Expected: {"createtime": "2021-06-01 10:53:24.269686", "dnum": "090703", "enddate": "2022-05-31", "fnum": 1.049, "num": 1, "lastmodifieddate": "2021-06-02 05:34:04.382279", "rolecode": 5,"startdate": "2021-06-01"}
    Received: [{}]

      83 |       .then(res => {
      84 |         console.log('Response Body :', JSON.stringify(res.body, null, 2))
    > 85 |         expect(res.body).toEqual({
         |                          ^
      86 |           dnum: '090703',
      87 |           num: 1,
      88 |           startdate: '2021-06-01'

'use strict'

const express = require('express')
const router = express.Router()
const { getDBDetails } = require('../utils/constants')
const executeDb2Query = require('../utils/db2')

router.post('/', async (req, res, next) => {
  try {
    if (req.body.constructor === Object && Object.keys(req.body).length === 0) {
      return res.status(400).send('Request Body is empty. Please check!!')
    }
    const request= req.body
    const getDetails = await executeDb2Query({
      sql: getDBDetails(request),
      log: req.log,
      name: 'Get Details',
      errorMsg: 'Get error while getting the Details '
    })

    
      return res.status(200).json(getDetails)
    } else {
      return res
        .status(400)
        .json({ message: 'No Records found for the given attributes' })
    }
  } catch (error) {
    return next(error)
  }
})