Added empty stub to keep directory

test/test-setup.spec.js

+
+// NOTE: Idea for this file comes from https://blog.risingstack.com/node-hero-node-js-unit-testing-tutorial/
+const sinon = require('sinon');
+const chai = require('chai');
+
+beforeEach(function(){
+  this.sandbox = sinon.createSandbox();
+})
+
+afterEach(function(){
+  this.sandbox.restore();
+});
+