From 4c4682c049bff580acf121741c91519dbdaf2131 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Chibon <pingou@pingoured.fr>
Date: Jan 16 2018 13:27:48 +0000
Subject: Raise an exception when the backend isn't the proper subclass


Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

---

diff --git a/rats/lib/__init__.py b/rats/lib/__init__.py
index 9178274..d3ac62f 100644
--- a/rats/lib/__init__.py
+++ b/rats/lib/__init__.py
@@ -34,7 +34,8 @@ def get_test_systems():
         _log.debug('Found backend: %s' % backend)
         if backend.name in configured_system:
             try:
-                isinstance(backend(), rats.lib.backends.Backend)
+                if not isinstance(backend(), rats.lib.backends.Backend):
+                    raise Exception()
                 backends.append(backend)
             except Exception as err:  # pragma: no cover
                 _log.debug(