--- /dev/null
+--- a/tests/runtests.py
++++ b/tests/runtests.py
+@@ -41,4 +41,5 @@
+ suite.addTest(loader.loadTestsFromName(name))
+
+ testRunner = unittest.TextTestRunner()
+-testRunner.run(suite)
++result = testRunner.run(suite)
++sys.exit(not result.wasSuccessful())