controller-test.js

// file: controller.spec.js

const proxyquire = require('proxyquire');
const sinon = require('sinon');
const chai = require('chai');
const { expect } = chai;

describe('calculateTotal', function(done) {
 it('calculates the total and updates the database', function() {
 
   const databaseUpdaterSpy = sinon.spy();
   const stub = {
     '../model/databaseUpdater': databaseUpdaterSpy,
   };
   const calculateTotal = proxyquire('../controller', stub);
   calculateTotal([2, 3, 5]);
   expect(databaseUpdaterSpy.getCall(0).calledWith(sinon.match({ body: 10 }))).to.be.true;
   done();
   
 })
})