added unit testing, and started implementing unit tests...phew

node_modules/async/internal/getIterator.js

@@ -0,0 +1,13 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+
+exports.default = function (coll) {
+    return iteratorSymbol && coll[iteratorSymbol] && coll[iteratorSymbol]();
+};
+
+var iteratorSymbol = typeof Symbol === 'function' && Symbol.iterator;
+
+module.exports = exports['default'];