Index: tests/unit_tests/test_dg_valves.py
===================================================================
diff -u -rfb9052e39fb778d3d029eda4d6917a0a1fcb9cbd -r82615ab9d1757ef67810f9fc267cd89a19a2e4c8
--- tests/unit_tests/test_dg_valves.py	(.../test_dg_valves.py)	(revision fb9052e39fb778d3d029eda4d6917a0a1fcb9cbd)
+++ tests/unit_tests/test_dg_valves.py	(.../test_dg_valves.py)	(revision 82615ab9d1757ef67810f9fc267cd89a19a2e4c8)
@@ -57,4 +57,4 @@
 
 
 if __name__ == '__main__':
-    unittest.main(verbosity=2)
+    sys.exit(unittest.main(verbosity=2).result.wasSuccessful())