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

node_modules/async/internal/createTester.js

@@ -0,0 +1,44 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = _createTester;
+
+var _noop = require('lodash/noop');
+
+var _noop2 = _interopRequireDefault(_noop);
+
+var _breakLoop = require('./breakLoop');
+
+var _breakLoop2 = _interopRequireDefault(_breakLoop);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _createTester(check, getResult) {
+    return function (eachfn, arr, iteratee, cb) {
+        cb = cb || _noop2.default;
+        var testPassed = false;
+        var testResult;
+        eachfn(arr, function (value, _, callback) {
+            iteratee(value, function (err, result) {
+                if (err) {
+                    callback(err);
+                } else if (check(result) && !testResult) {
+                    testPassed = true;
+                    testResult = getResult(true, value);
+                    callback(null, _breakLoop2.default);
+                } else {
+                    callback();
+                }
+            });
+        }, function (err) {
+            if (err) {
+                cb(err);
+            } else {
+                cb(null, testPassed ? testResult : getResult(false));
+            }
+        });
+    };
+}
+module.exports = exports['default'];