From d2b627cc1c769d9861bbea791988316ce41df70b Mon Sep 17 00:00:00 2001
From: Thomas Scholtes <thomas-scholtes@gmx.de>
Date: Sun, 9 Mar 2014 12:50:24 +0100
Subject: [PATCH] Make sure the png_data method is available

---
 test/test_mediafile.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/test_mediafile.py b/test/test_mediafile.py
index afe0e3ac3..8b4386f5b 100644
--- a/test/test_mediafile.py
+++ b/test/test_mediafile.py
@@ -63,7 +63,7 @@ class ArtTestMixin(object):
         self.assertEqual(mediafile.art, self.jpg_data)
 
 
-class ImageStructureTestMixin(object):
+class ImageStructureTestMixin(ArtTestMixin):
     """Test reading and writing multiple image tags.
 
     The tests use the `image` media file fixture. The tags of these files