Add some common tests

Author: rmk135

tests/test_common.py

@@ -0,0 +1,13 @@
+"""Common unittests."""
+
+import unittest2 as unittest
+
+from domain_models import VERSION
+
+
+class VersionTest(unittest.TestCase):
+    """Version constant tests."""
+
+    def test_version_follows_semantic_versioning(self):
+        """Test that version follows semantic versioning."""
+        self.assertEquals(len(VERSION.split('.')), 3)