From 594d263eaffebeb3539c403ac0a0227acacdaed7 Mon Sep 17 00:00:00 2001
From: Jean Ponchon <gelule@gmail.com>
Date: Fri, 16 May 2014 17:38:20 +0200
Subject: [PATCH] Undefined callback error in mocha.run() on browser

Mocha.prototype.run(callback) provide an error status to the callback (0/1).
But this value is not forwarded to the browser callback.

    mocha.run(function(err) {
      console.log(err); // Always undefined
    })
---
 support/tail.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/support/tail.js b/support/tail.js
index 018add8d0c..999d38da0f 100644
--- a/support/tail.js
+++ b/support/tail.js
@@ -135,12 +135,12 @@ mocha.run = function(fn){
   if (query.grep) mocha.grep(query.grep);
   if (query.invert) mocha.invert();
 
-  return Mocha.prototype.run.call(mocha, function(){
+  return Mocha.prototype.run.call(mocha, function(err){
     // The DOM Document is not available in Web Workers.
     if (global.document) {
       Mocha.utils.highlightTags('code');
     }
-    if (fn) fn();
+    if (fn) fn(err);
   });
 };