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

node_modules/async/internal/wrapAsync.js

@@ -0,0 +1,25 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.isAsync = undefined;
+
+var _asyncify = require('../asyncify');
+
+var _asyncify2 = _interopRequireDefault(_asyncify);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var supportsSymbol = typeof Symbol === 'function';
+
+function isAsync(fn) {
+    return supportsSymbol && fn[Symbol.toStringTag] === 'AsyncFunction';
+}
+
+function wrapAsync(asyncFn) {
+    return isAsync(asyncFn) ? (0, _asyncify2.default)(asyncFn) : asyncFn;
+}
+
+exports.default = wrapAsync;
+exports.isAsync = isAsync;