bears/: Update required Python version to 3.4.4

coala updated its minimum version to 3.4.4 a
while ago and bears was not also updated.

Adds tests to cover assert_supported_version,
so that the pragma no cover can be removed
and setup.py does not need to be run by coverage.

Related to coala/coala#4350

.ci/check_unsupported.sh

@@ -29,6 +29,6 @@ fi
 # error when no lines selected by grep
 set -e
 
-grep -q 'coala supports only python 3.4 or later' setup.log
+grep -q 'coala supports only python 3.4.4 or later' setup.log
 
 echo "Unsupported check completed successfully"

bears/__init__.py

@@ -18,9 +18,9 @@
 __version__ = VERSION
 
 
-def assert_supported_version():  # pragma: no cover
-    if sys.version_info < (3, 4):
-        print('coala supports only python 3.4 or later.')
+def assert_supported_version():
+    if sys.version_info < (3, 4, 4):
+        print('coala supports only python 3.4.4 or later.')
         exit(4)
 
 

tests/coalaBearTest.py

@@ -4,6 +4,8 @@
 import bears
 import coalib
 
+from bears import assert_supported_version
+
 
 class coalaBearTest(unittest.TestCase):
 
@@ -23,3 +25,20 @@ def test_check_coala_version(self):
             bears.check_coala_version()
             self.assertIn('Version mismatch between coala',
                           cm.output[0])
+
+    @unittest.mock.patch('sys.version_info', tuple((2, 7, 11)))
+    def test_python_version_27(self):
+        with self.assertRaises(SystemExit) as cm:
+            assert_supported_version()
+
+        self.assertEqual(cm.exception.code, 4)
+
+    @unittest.mock.patch('sys.version_info', tuple((3, 3, 6)))
+    def test_python_version_33(self):
+        with self.assertRaises(SystemExit) as cm:
+            assert_supported_version()
+
+        self.assertEqual(cm.exception.code, 4)
+
+    def test_python_version_34(self):
+        assert_supported_version()