Give a binary document name.

tests/test_search.py

@@ -13,6 +13,7 @@ from docutils import frontend, utils
 from docutils.parsers import rst
 
 from sphinx.search import IndexBuilder
+from sphinx.util.pycompat import b
 
 
 settings = parser = None
@@ -31,7 +32,7 @@ test that non-comments are indexed: fermion
 '''
 
 def test_wordcollector():
-    doc = utils.new_document('test data', settings)
+    doc = utils.new_document(b('test data'), settings)
     doc['file'] = 'dummy'
     parser.parse(FILE_CONTENTS, doc)