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

node_modules/async/doWhilst.js

@@ -0,0 +1,59 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = doWhilst;
+
+var _noop = require('lodash/noop');
+
+var _noop2 = _interopRequireDefault(_noop);
+
+var _slice = require('./internal/slice');
+
+var _slice2 = _interopRequireDefault(_slice);
+
+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 }; }
+
+/**
+ * The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
+ * the order of operations, the arguments `test` and `iteratee` are switched.
+ *
+ * `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
+ *
+ * @name doWhilst
+ * @static
+ * @memberOf module:ControlFlow
+ * @method
+ * @see [async.whilst]{@link module:ControlFlow.whilst}
+ * @category Control Flow
+ * @param {AsyncFunction} iteratee - A function which is called each time `test`
+ * passes. Invoked with (callback).
+ * @param {Function} test - synchronous truth test to perform after each
+ * execution of `iteratee`. Invoked with any non-error callback results of
+ * `iteratee`.
+ * @param {Function} [callback] - A callback which is called after the test
+ * function has failed and repeated execution of `iteratee` has stopped.
+ * `callback` will be passed an error and any arguments passed to the final
+ * `iteratee`'s callback. Invoked with (err, [results]);
+ */
+function doWhilst(iteratee, test, callback) {
+    callback = (0, _onlyOnce2.default)(callback || _noop2.default);
+    var _iteratee = (0, _wrapAsync2.default)(iteratee);
+    var next = function (err /*, ...args*/) {
+        if (err) return callback(err);
+        var args = (0, _slice2.default)(arguments, 1);
+        if (test.apply(this, args)) return _iteratee(next);
+        callback.apply(null, [null].concat(args));
+    };
+    _iteratee(next);
+}
+module.exports = exports['default'];