使用mocha，node.js进行功能密集测试

Question

i am trying to write a unit test for my node.js code . I am able to write the test for a function but i want to test each network query(query fetching data from DB) whether they are returning desired response or not. I am sharing my node.js code as well as my test code.

node.js code(routes.js)

module.exports = {
   getUser: {
        get: function(req, parameters, environment) {

             var id = req.queryString.id;

                  return new Promise(function(resolve, reject) {

                       db.tx(t =>{
                            return t.one("select configuration_value from fint.configuration where configuration_key='LOAN' and application_id =(select application_id from fint.application where application_name='Product Tailoring')")
                       })  
                       .then(conf => {
                            conf_key = conf.configuration_value;
                       }) 

                       db.tx(t =>{
                           return t.one("select smart_account_type_id from fint.smart_account_type where smart_account_type_name='LOAN'")
                       })  
                      .then(acc_type => {
                           smart_acc_type_id =  acc_type.smart_account_type_id;
                      })
                  }
        })
   }
}

This is a sample code, what exactly i want is to run the test on the individual queries instead of the whole function.

My test code (test.js)

var expect = require('chai').expect;
var Promise = require('bluebird');
var chai = require('chai'); 
var app = require('../api/smartAccount/identifyLoan/getDirectDebitTrans/routes');

describe("Unit testing for function", function(){
    it("Testing the function using mocha", function(done){
        var req = {
            queryString: {
                uniqueUserId: 101
            }
        };

        var test = app.getUser.get(req);
        return expect(Promise.resolve(test)).to.have.property('_bitField');
        done();
    });
});

Any leads will be appreciated, and if anybody come across some links regarding the same, please share. TIA

Answer 1

First of all, if you want to test each query separately, I would refactor the code and wrap each query in a separate function. Thus, you will be able to do unit testing over real units. If you're not able to test a part of your app easily, it's probably because something isn't designed the right way. By the way, you return a promise that never resolves (or rejects)!?

About the unit testing with promise function, you could give a try to co-mocha . Using such a flow control framework will make your promise tests much more readable.

module.exports = {
  getUser: {
    get: function(req, parameters, environment) {
      var id = req.queryString.id;
      return new Promise(function(resolve, reject) {
        getConfKey(id)
        .then(confKey => {
          getAccType(id)
          .then(accType => {
            resolve({key: confKey, type: accType})
          })
        })
      })
    })

    getConfKey: function(id) {
      return new Promise(function(resolve, reject) {
        db.tx(t =>{
          return t.one("select configuration_value from fint.configuration where configuration_key='LOAN' and application_id =(select application_id from fint.application where application_name='Product Tailoring')")
        })  
        .then(conf => {
          resolve(conf.configuration_value);
        })
      })
    }

    getAccType: function(id) {
      return new Promise(function(resolve, reject) {
        db.tx(t =>{
          return t.one("select smart_account_type_id from fint.smart_account_type where smart_account_type_name='LOAN'")
        })  
        .then(acc_type => {
          resolve(acc_type.smart_account_type_id);
        })
      })
    }
  }
}

Of course, this is an example. If both functions are independent, you can execute these concurrently. Concurrency is not the point of this question.