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

node_modules/async/during.js

@@ -0,0 +1,76 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = during;
+
+var _noop = require('lodash/noop');
+
+var _noop2 = _interopRequireDefault(_noop);
+
+var _onlyOnce = require('./internal/onlyOnce');
+
+var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
+
+var _wrapAsync = require('./internal/wrapAsync');
+
+var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Like [`whilst`]{@link module:ControlFlow.whilst}, except the `test` is an asynchronous function that
+ * is passed a callback in the form of `function (err, truth)`. If error is
+ * passed to `test` or `fn`, the main callback is immediately called with the
+ * value of the error.
+ *
+ * @name during
+ * @static
+ * @memberOf module:ControlFlow
+ * @method
+ * @see [async.whilst]{@link module:ControlFlow.whilst}
+ * @category Control Flow
+ * @param {AsyncFunction} test - asynchronous truth test to perform before each
+ * execution of `fn`. Invoked with (callback).
+ * @param {AsyncFunction} fn - An async function which is called each time
+ * `test` passes. Invoked with (callback).
+ * @param {Function} [callback] - A callback which is called after the test
+ * function has failed and repeated execution of `fn` has stopped. `callback`
+ * will be passed an error, if one occurred, otherwise `null`.
+ * @example
+ *
+ * var count = 0;
+ *
+ * async.during(
+ *     function (callback) {
+ *         return callback(null, count < 5);
+ *     },
+ *     function (callback) {
+ *         count++;
+ *         setTimeout(callback, 1000);
+ *     },
+ *     function (err) {
+ *         // 5 seconds have passed
+ *     }
+ * );
+ */
+function during(test, fn, callback) {
+    callback = (0, _onlyOnce2.default)(callback || _noop2.default);
+    var _fn = (0, _wrapAsync2.default)(fn);
+    var _test = (0, _wrapAsync2.default)(test);
+
+    function next(err) {
+        if (err) return callback(err);
+        _test(check);
+    }
+
+    function check(err, truth) {
+        if (err) return callback(err);
+        if (!truth) return callback(null);
+        _fn(next);
+    }
+
+    _test(check);
+}
+module.exports = exports['default'];