Fix failing py34 tests

tests/test_rubygems.py

@@ -10,7 +10,7 @@ import subprocess
 import tempfile
 import unittest
 
-from six import StringIO
+from six import BytesIO
 
 import zc.buildout
 
@@ -59,8 +59,8 @@ class fixture(object):
             ('urlopen', 'rubygems.urllib.request.urlopen'),
             ('hexagonit', 'rubygems.hexagonit.recipe.download.Recipe'),
         ))
-        self.patches['urlopen'].return_value = StringIO(
-            'https://rubygems.org/rubygems/rubygems-1.0.zip'
+        self.patches['urlopen'].return_value = BytesIO(
+            b'https://rubygems.org/rubygems/rubygems-1.0.zip'
         )
 
         self.makedirs((
@@ -176,7 +176,7 @@ class RubyGemsTests(unittest.TestCase):
 
     @fixture({'recipe': {'gems': 'sass'}})
     def test_no_version(self, path, patches, buildout, name, options):
-        patches['urlopen'].return_value = StringIO('')
+        patches['urlopen'].return_value = BytesIO(b'')
         recipe = rubygems.Recipe(buildout, name, options)
         self.assertRaises(zc.buildout.UserError, recipe.install)