diff --git a/unittests/test_transformers.py b/unittests/test_transformers.py
index 06b089f79f1c2eb75ad9ca0fa116290a253a0666..ac530c9147fd7a4c86fa2ef668b6366a722935b0 100644
--- a/unittests/test_transformers.py
+++ b/unittests/test_transformers.py
@@ -71,9 +71,11 @@ def test_simple_transformer():
                 assert r.get_property("Day").value == "Tuesday"
                 assert r.get_property("DaySplit").value == ["Tue"]
             else:
-                raise RuntimeError("There is no other short version!")
+                # unexpected occurence of a short form, something wrong with test directories
+                assert False
         elif r.parents[0].name == "Number":
             assert r.get_property("num") is not None
             assert r.get_property("num").value == "'12345 5 '"
         else:
-            raise RuntimeError("unkown error")
+            # unkown error, something wrong with test directories
+            assert False