test version check

pirate/pirate.py

@@ -1,7 +1,7 @@
 import sys
 from distutils.version import LooseVersion
 if LooseVersion(sys.version) < LooseVersion("3.4.0"):
-    print("Python 3.4.0 required")
+    print("At least python 3.4.0 required. Your version is "+sys.version)
     sys.exit(1)
 
 import re

tests/test_version.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+import sys
+import unittest
+import importlib
+from unittest import mock
+from unittest.mock import patch, call, MagicMock
+
+import pirate.pirate
+
+class TestPirate(unittest.TestCase):
+
+    @patch('sys.exit')
+    def test_unsupported(self, mock_exit):
+        sys.version = '3.2.1 (default, dec  7 2015, 12:58:09) \n[gcc 5.2.0]'
+        importlib.reload(pirate.pirate)
+        mock_exit.assert_called_once_with(1)
+
+    @patch('sys.exit')
+    def test_unsupported2(self, mock_exit):
+        sys.version = '2.5.1 (default, dec  7 2015, 12:58:09) \n[gcc 5.2.0]'
+        importlib.reload(pirate.pirate)
+        mock_exit.assert_called_once_with(1)
+
+
+    @patch('sys.exit')
+    def test_supported(self, mock_exit):
+        sys.version = '3.5.1 (default, dec  7 2015, 12:58:09) \n[gcc 5.2.0]'
+        importlib.reload(pirate.pirate)
+        mock_exit.assert_not_called()
+
+    @patch('sys.exit')
+    def test_supported_exact(self, mock_exit):
+        sys.version = '3.4.0 (default, dec  7 2015, 12:58:09) \n[gcc 5.2.0]'
+        importlib.reload(pirate.pirate)
+        mock_exit.assert_not_called()
+
+if __name__ == '__main__':
+    unittest.main()