How to mock multer with supertest?

I had a middleware helper to wrap multer like this

// middleware/index.js

const multer = require('multer');
exports.multerUpload = () => multer({...});

Then use it in my routes like so

// routes.js

const { multerUpload } = require('path/to/middlewares');

app.post('/upload', multerUpload().any());

Then, in my tests, I can stub out multerUpload

// test.js

const middlewares = require('path/to/middlewares');
sinon.stub(middlewares, 'multerUpload').callsFake(
      () => {
        return {
          any() {
            return (req, res, next) => {
              // You can do whatever you like to the request body here e.g
              req.body = { title: req.query.title };
              req.files = [{ location: 'sample.url', key: 'sample.key' }];
              return next();
            };
          },
        };
      },
);

Mock Multer using Jest (Similar to above ans but using Jest)

App.js

Used multer as middleware

const app = express();
app.use()
app.use(multer({ dest: FILE_UPLOAD_PATH }).single('datafile'));
app.use('/api', apiRoutes);

apiRoute.js

router.post('/datasources', async function (req, res) {
    
    ...

});

apiRoute.test.js

const multer = require('multer');

jest.mock('multer');

multer.mockImplementation(() => {
  return {
    single() {
      return (req, res, next) => {
        req.body = { title: req.query.title };
        req.file = [{ originalname: 'sample.name', mimetype: 'sample.type', path: 'sample.url' }];
        return next();
      };
    },
  };
});

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