BUG: Tee doesn't have encoding or errors attrs.

On Python3, distutils.log uses the encoding and errors attribute of
sys.stdout and stderr.  Tests error out when nose is run with xunit and
it replaces the stdout/stderr with a Tee.

nose/plugins/xunit.py

@@ -120,11 +120,12 @@ def exc_message(exc_info):
 
 class Tee(object):
     def __init__(self, encoding, *args):
-        self._encoding = encoding
+        self.encoding = encoding
         self._streams = args
+        self.errors = None
 
     def write(self, data):
-        data = force_unicode(data, self._encoding)
+        data = force_unicode(data, self.encoding)
         for s in self._streams:
             s.write(data)
 

unit_tests/test_xunit.py

@@ -8,7 +8,7 @@
 
 from nose.pyversion import UNICODE_STRINGS
 from nose.tools import eq_
-from nose.plugins.xunit import Xunit, escape_cdata, id_split
+from nose.plugins.xunit import Xunit, escape_cdata, id_split, Tee
 from nose.exc import SkipTest
 from nose.config import Config
 
@@ -67,11 +67,29 @@ def test_file_from_opt(self):
         (options, args) = parser.parse_args(["--xunit-file=blagojevich.xml"])
         eq_(options.xunit_file, "blagojevich.xml")
 
+class TestTee(unittest.TestCase):
+    def setUp(self):
+        self.orig_stderr = sys.stderr
+        sys.stderr = Tee('utf-8', self.orig_stderr)
+
+    def tearDown(self):
+        sys.stderr = self.orig_stderr
+
+    def test_tee_has_error_and_encoding_attributes(self):
+        tee = Tee('utf-8', sys.stdout)
+        self.assertTrue(hasattr(tee, 'encoding'))
+        self.assertTrue(hasattr(tee, 'errors'))
+
+    def test_tee_works_with_distutils_log(self):
+        from distutils.log import Log, DEBUG
+        l = Log(DEBUG)
+        l.warn('Test')
+
 class TestXMLOutputWithXML(unittest.TestCase):
 
     def setUp(self):
         self.xmlfile = os.path.abspath(
-            os.path.join(os.path.dirname(__file__), 
+            os.path.join(os.path.dirname(__file__),
                             'support', 'xunit.xml'))
         parser = optparse.OptionParser()
         self.x = Xunit()
@@ -215,7 +233,7 @@ def test_non_utf8_error(self):
         test = mktest()
         self.x.beforeTest(test)
         try:
-            raise RuntimeError(chr(128)) # cannot encode as utf8 
+            raise RuntimeError(chr(128)) # cannot encode as utf8
         except RuntimeError:
             some_err = sys.exc_info()
         self.x.addError(test, some_err)
@@ -309,4 +327,3 @@ def test_addSuccess_early(self):
             assert '<?xml version="1.0" encoding="UTF-8"?>' in result
             assert ('<testcase classname="test_xunit.TC" '
                     'name="runTest" time="0') in result
-