Intensive testing of a function using mocha , node.js - node.js

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.