Installing unittest2 on Python 2.6.

setup.py

@@ -58,6 +58,9 @@ if sys.version_info[0] == 3:
 else:
     extra_opts['tests_require'] = ['nose', 'coverage', 'blinker', 'django>=1.4.2', 'PIL', 'jinja2>=2.6', 'python-dateutil']
 
+    if sys.version_info[0] == 2 and sys.version_info[1] == 6:
+        extra_opts['tests_require'].append('unittest2')
+
 setup(name='mongoengine',
       version=VERSION,
       author='Harry Marr',

tests/test_connection.py

@@ -1,6 +1,11 @@
 import sys
 sys.path[0:0] = [""]
-import unittest
+
+try:
+    import unittest2 as unittest
+except ImportError:
+    import unittest
+
 import datetime
 
 import pymongo