From 819942e96451ebc9664a6a82ef02e7f1745b8f1a Mon Sep 17 00:00:00 2001
From: Bruno Oliveira <nicoddemus@gmail.com>
Date: Tue, 21 Jun 2016 12:28:36 +0200
Subject: [PATCH] Return explicit None from rewrite hook's find_module

---
 _pytest/assertion/rewrite.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/_pytest/assertion/rewrite.py b/_pytest/assertion/rewrite.py
index b85ca686cf9..fd4f66cd0d5 100644
--- a/_pytest/assertion/rewrite.py
+++ b/_pytest/assertion/rewrite.py
@@ -87,7 +87,7 @@ def find_module(self, name, path=None):
 
         fn_pypath = py.path.local(fn)
         if not self._should_rewrite(fn_pypath, state):
-            return
+            return None
 
         # The requested module looks like a test file, so rewrite it. This is
         # the most magical part of the process: load the source, rewrite the