From b1dffc9eec6a692eb4b43ff5c73fc76f2261f925 Mon Sep 17 00:00:00 2001
From: Tyler Long <tyler4long@gmail.com>
Date: Tue, 12 Sep 2017 16:23:21 +0800
Subject: [PATCH] Fix styleSheets index issue

---
 src/utils.spec.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils.spec.js b/src/utils.spec.js
index 97de73c3a..8ba4263d2 100644
--- a/src/utils.spec.js
+++ b/src/utils.spec.js
@@ -100,7 +100,7 @@ describe('when cloning CSS ', function () {
     svg.setAttribute('id', 'mermaid-01')
 
     // Firefox throws a SecurityError when trying to access cssRules
-    document.styleSheets[document.styleSheets.length] = {
+    document.styleSheets[document.styleSheets.length - 1] = {
       get cssRules () { throw new Error('SecurityError') }
     }