From 4395ae5f513b0eb22c28af332cb7c41cbe750b17 Mon Sep 17 00:00:00 2001
From: semenkozin <i.a.m@bk.ru>
Date: Thu, 24 Apr 2014 05:53:16 +0400
Subject: [PATCH] Fix TypeError when generating diff for an object with
 circular structure; fixes #1179

---
 lib/reporters/base.js | 2 +-
 mocha.js              | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/reporters/base.js b/lib/reporters/base.js
index 0754fe1a37..44c0d7a5fa 100644
--- a/lib/reporters/base.js
+++ b/lib/reporters/base.js
@@ -466,7 +466,7 @@ function stringify(obj) {
  function canonicalize(obj, stack) {
    stack = stack || [];
 
-   if (utils.indexOf(stack, obj) !== -1) return obj;
+   if (utils.indexOf(stack, obj) !== -1) return '[Circular]';
 
    var canonicalizedObj;
 
diff --git a/mocha.js b/mocha.js
index 19edc87d97..66943316f1 100644
--- a/mocha.js
+++ b/mocha.js
@@ -2317,7 +2317,7 @@ function stringify(obj) {
  function canonicalize(obj, stack) {
    stack = stack || [];
 
-   if (utils.indexOf(stack, obj) !== -1) return obj;
+   if (utils.indexOf(stack, obj) !== -1) return '[Circular]';
 
    var canonicalizedObj;