Index: pyyaml/trunk/tests/lib/test_input_output.py
===================================================================
--- pyyaml/trunk/tests/lib/test_input_output.py	(revision 334)
+++ pyyaml/trunk/tests/lib/test_input_output.py	(revision 335)
@@ -5,5 +5,11 @@
 def _unicode_open(file, encoding, errors='strict'):
     info = codecs.lookup(encoding)
-    srw = codecs.StreamReaderWriter(file, info.streamreader, info.streamwriter, errors)
+    if isinstance(info, tuple):
+        reader = info[2]
+        writer = info[3]
+    else:
+        reader = info.streamreader
+        writer = info.streamwriter
+    srw = codecs.StreamReaderWriter(file, reader, writer, errors)
     srw.encoding = encoding
     return srw