chore(tests): Also run tests on Python 2.6

tests/common.py

@@ -16,7 +16,12 @@
 
 import os
 import tempfile
-import unittest
+import sys
+try:
+    assert sys.version_info >= (2, 7)
+    import unittest
+except:
+    import unittest2 as unittest
 
 import yaml
 

tests/test_cli.py

@@ -23,14 +23,19 @@ import locale
 import os
 import pty
 import shutil
-import unittest
 import sys
+try:
+    assert sys.version_info >= (2, 7)
+    import unittest
+except:
+    import unittest2 as unittest
 
 from yamllint import cli
 
 from tests.common import build_temp_workspace
 
 
+@unittest.skipIf(sys.version_info < (2, 7), 'Python 2.6 not supported')
 class CommandLineTestCase(unittest.TestCase):
     @classmethod
     def setUpClass(cls):

tests/test_config.py

@@ -21,7 +21,11 @@ except ImportError:
 import os
 import shutil
 import sys
-import unittest
+try:
+    assert sys.version_info >= (2, 7)
+    import unittest
+except:
+    import unittest2 as unittest
 
 from yamllint import cli
 from yamllint import config
@@ -334,6 +338,7 @@ class IgnorePathConfigTestCase(unittest.TestCase):
 
         shutil.rmtree(cls.wd)
 
+    @unittest.skipIf(sys.version_info < (2, 7), 'Python 2.6 not supported')
     def test_run_with_ignored_path(self):
         sys.stdout = StringIO()
         with self.assertRaises(SystemExit):

tests/test_linter.py

@@ -15,8 +15,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import io
-
-import unittest
+import sys
+try:
+    assert sys.version_info >= (2, 7)
+    import unittest
+except:
+    import unittest2 as unittest
 
 from yamllint.config import YamlLintConfig
 from yamllint import linter

tests/test_module.py

@@ -18,9 +18,15 @@ import os
 import shutil
 import subprocess
 import tempfile
-import unittest
+import sys
+try:
+    assert sys.version_info >= (2, 7)
+    import unittest
+except:
+    import unittest2 as unittest
 
 
+@unittest.skipIf(sys.version_info < (2, 7), 'Python 2.6 not supported')
 class ModuleTestCase(unittest.TestCase):
     def setUp(self):
         self.wd = tempfile.mkdtemp(prefix='yamllint-tests-')

tests/test_parser.py

@@ -14,7 +14,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-import unittest
+import sys
+try:
+    assert sys.version_info >= (2, 7)
+    import unittest
+except:
+    import unittest2 as unittest
 
 import yaml