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+/*!
+ * Chai - overwriteMethod utility
+ * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
+ * MIT Licensed
+ */
+
+/**
+ * ### overwriteMethod (ctx, name, fn)
+ *
+ * Overwites an already existing method and provides
+ * access to previous function. Must return function
+ * to be used for name.
+ *
+ *     utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
+ *       return function (str) {
+ *         var obj = utils.flag(this, 'object');
+ *         if (obj instanceof Foo) {
+ *           new chai.Assertion(obj.value).to.equal(str);
+ *         } else {
+ *           _super.apply(this, arguments);
+ *         }
+ *       }
+ *     });
+ *
+ * Can also be accessed directly from `chai.Assertion`.
+ *
+ *     chai.Assertion.overwriteMethod('foo', fn);
+ *
+ * Then can be used as any other assertion.
+ *
+ *     expect(myFoo).to.equal('bar');
+ *
+ * @param {Object} ctx object whose method is to be overwritten
+ * @param {String} name of method to overwrite
+ * @param {Function} method function that returns a function to be used for name
+ * @namespace Utils
+ * @name overwriteMethod
+ * @api public
+ */
+
+module.exports = function (ctx, name, method) {
+  var _method = ctx[name]
+    , _super = function () { return this; };
+
+  if (_method && 'function' === typeof _method)
+    _super = _method;
+
+  ctx[name] = function () {
+    var result = method(_super).apply(this, arguments);
+    return result === undefined ? this : result;
+  }
+};