From db0d1fd0fa225843fa2076854187f8bfd1f2e7e4 Mon Sep 17 00:00:00 2001
From: metalex9 <alexbainter@gmail.com>
Date: Wed, 17 Jan 2018 20:53:59 -0600
Subject: [PATCH] Filter new files before they're added.

---
 bin/_mocha | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/bin/_mocha b/bin/_mocha
index be76e61b8b..e93909c66b 100755
--- a/bin/_mocha
+++ b/bin/_mocha
@@ -496,8 +496,14 @@ args.forEach(arg => {
     throw err;
   }
 
-  files = files.concat(newFiles)
-    .filter(fileName => program.exclude.every(pattern => !minimatch(fileName, pattern)));
+  if (typeof newFiles !== 'undefined') {
+    if (typeof newFiles === 'string') {
+      newFiles = [newFiles];
+    }
+    newFiles = newFiles.filter(fileName => program.exclude.every(pattern => !minimatch(fileName, pattern)));
+  }
+
+  files = files.concat(newFiles);
 });
 
 if (!files.length) {