BUG: Convert to bytes before comparing binary blobs.

IPython/html/services/contents/tests/test_contents_api.py

@@ -289,7 +289,7 b' class APITest(NotebookTestBase):'
             self.assertEqual(model['format'], 'base64')
             self.assertEqual(model['type'], 'file')
             self.assertEqual(
-                base64.decodestring(model['content']),
+                base64.decodestring(model['content'].encode('ascii')),
                 self._blob_for_name(name),
             )