From 2685e1357f457757c3fa3f5d84a837ed9a51b646 Mon Sep 17 00:00:00 2001
From: Glenn Anderson <ondoher@gmail.com>
Date: Wed, 5 Apr 2017 07:38:55 -0700
Subject: [PATCH] fix(middleware): does not work with mootools (#2591)

Change karma.js to check for own property during for...in loop
Because mootools adds functions to the array prototype,
the use of for..in will get more than the array elements.
---
 lib/middleware/karma.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/middleware/karma.js b/lib/middleware/karma.js
index 3392096bd..831668324 100644
--- a/lib/middleware/karma.js
+++ b/lib/middleware/karma.js
@@ -179,6 +179,10 @@ var createKarmaMiddleware = function (
             var filePath = file.path
             var fileExt = path.extname(filePath)
 
+            if (!files.included.hasOwnProperty(i)) {
+              continue
+            }
+
             if (!file.isUrl) {
               filePath = filePathToUrlPath(filePath, basePath, urlRoot, proxyPath)