Description: Check contents of message, not entire string
 The exception string changed in Python 3.5. Thus update not_found test to
 check for critical elements within the exception string instead of the entire
 string.
Author: Neil Williams <codehelp@debian.org>
Bug: https://bugs.launchpad.net/versiontools/+bug/1507523
Bug-Debian: https://bugs.debian.org/802155

--- a/versiontools/tests.py
+++ b/versiontools/tests.py
@@ -148,6 +148,4 @@
         except Exception:
             e = sys.exc_info()[1]
             self.assertTrue(isinstance(e, DistutilsSetupError))
-            self.assertEqual(str(e), "Unable to access '__nonexisting__' in "
-                                      "'versiontools': 'module' object has "
-                                      "no attribute '__nonexisting__'")
+            self.assertIn("Unable to access '__nonexisting__'", str(e))