diff --git a/tests/tests_unit/test_configtools.py b/tests/tests_unit/test_configtools.py
index fdb86a10..90016085 100644
--- a/tests/tests_unit/test_configtools.py
+++ b/tests/tests_unit/test_configtools.py
@@ -412,5 +412,3 @@ def test_env_substitution(self):
         config5 = load_yaml(config_file5, SimpleStringConfig)
 
         self.assertEqual(config5.string_field, "veryheyocrowded")
-
-        self.fail()