diff -ruN a/tests/test_dnssec.py b/tests/test_dnssec.py
--- a/tests/test_dnssec.py	2015-06-13 20:26:21.000000000 +0800
+++ b/tests/test_dnssec.py	2016-02-12 14:14:10.556941459 +0800
@@ -13,7 +13,7 @@
 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
-import unittest
+import unittest2 as unittest
 
 import dns.dnssec
 import dns.name
diff -ruN a/tests/test_exceptions.py b/tests/test_exceptions.py
--- a/tests/test_exceptions.py	2015-06-13 20:26:21.000000000 +0800
+++ b/tests/test_exceptions.py	2016-02-12 14:13:58.496896295 +0800
@@ -14,7 +14,7 @@
 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 import binascii
-import unittest
+import unittest2 as unittest
 
 from dns.exception import DNSException

diff -ruN a/tests/test_rdtypeanyeui.py a_patch/tests/test_rdtypeanyeui.py
--- a/tests/test_rdtypeanyeui.py	2016-01-09 08:16:49.000000000 +0800
+++ b/tests/test_rdtypeanyeui.py	2016-02-12 17:57:19.699264077 +0800
@@ -14,7 +14,7 @@
 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 # OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
-import unittest
+import unittest2 as unittest
 try:
     from StringIO import StringIO
 except ImportError:

diff -ruN a/dns/tokenizer.py a_patch/dns/tokenizer.py
--- a/dns/tokenizer.py	2015-06-13 20:26:21.000000000 +0800
+++ b/dns/tokenizer.py	2016-02-12 17:48:41.339066543 +0800
@@ -15,6 +15,7 @@
 
 """Tokenize DNS master file format"""
 
+import StringIO
 import cStringIO
 import sys
 
@@ -196,7 +197,11 @@
         """
 
         if isinstance(f, (str, unicode)):
-            f = cStringIO.StringIO(f)
+            # cStringIO doesn't support unicode
+            if isinstance(f, unicode):
+                f = StringIO.StringIO(f)
+            else:
+                f = cStringIO.StringIO(f)
             if filename is None:
                 filename = '<string>'
         else: