Just hard-depend on unittest2.
diff --git a/tests/support.py b/tests/support.py
index 1b10c34..0cbdb2c 100644
--- a/tests/support.py
+++ b/tests/support.py
@@ -1,11 +1,7 @@
 import sys
 
 info = sys.version_info
-if info[:3] >= (3, 2, 0):
-    # for Python 3.2 ordinary unittest is fine
-    import unittest as unittest2
-else:
-    import unittest2
+import unittest2
 
 
 try: