Node.js - Unit Testing Middleware -

i have api middleware function use filter incoming requests. functions checks present of token in header, makes 2 calls database, 1 check token , 1 information , pass on request object, if 1st call successful.

i struggling understand how unit test functions, mocking request object , database calls.

middleware.js

exports.checktoken = function (req, res, next) {   if (!req.get('token')) {       return res.status(400).json('bad request');   }    var token = req.get('token'); //get token header     user.findone({'token': token}, function(err, user) {       // skipped error checking or no user found       account.findone({'_id': user.account}, function(err, account) {           // skipped error checking or no account found           req.somevalue = account;           return next();       });   }); }; 

currently using mocha, chai , sinon , thinking of following:

• mock user.findone , account.findone using sinon.stub()

• not sure req, res , next objects. how emulate these?

i think best choice use supertest.

https://www.npmjs.com/package/supertest

this package allow run tests emulate full request cicle on application.