use unittest2 on py26 to fix tests

.travis.yml

@@ -1,11 +1,14 @@
 language: python
 python:
-  - "2.6"
-  - "2.7"
-  - "3.3"
-  - "3.4"
+    - "2.6"
+    - "2.7"
+    - "3.3"
+    - "3.4"
 # command to install dependencies
-install: "pip install -r dev-requirements.txt"
+install: 
+    - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then travis_retry pip install --use-mirrors unittest2; fi
+    - travis_retry pip install --use-mirrors -r dev-requirements.txt
 # command to run tests
 script: nosetests
+# use new travis-ci container-based infrastructure
 sudo: false

tests/test_wakatime_base.py

@@ -2,13 +2,18 @@
 
 
 import logging
-import unittest
 from wakatime.packages.requests.models import Response
 
 try:
     from mock import patch
-except:
+except ImportError:
     from unittest.mock import patch
+try:
+    # Python 2.6
+    import unittest2 as unittest
+except ImportError:
+    # Python >= 2.7
+    import unittest
 
 from wakatime.base import main
 
@@ -21,8 +26,8 @@ class BaseTestCase(unittest.TestCase):
         logging.disable(logging.CRITICAL)
 
     def test_help_contents(self, mock_requests):
+        args = ['', '--help']
         with self.assertRaises(SystemExit):
-            args = ['', '--help']
             retval = main(args)
             self.assertEquals(retval, 0)
 

tox.ini

@@ -1,5 +1,7 @@
 [tox]
-envlist = py26, py27, py33, py34
+envlist = py26
 [testenv]
-deps = -rdev-requirements.txt
+deps =
+    -rdev-requirements.txt
+    py26: unittest2
 commands = nosetests