diff --git a/tests/test_mounted_middleware.py b/tests/test_mounted_middleware.py
index 927b4ff1..a2be2fbd 100644
--- a/tests/test_mounted_middleware.py
+++ b/tests/test_mounted_middleware.py
@@ -181,3 +181,4 @@ def test_exception():
             return text("BAD")
     except MiddlewareTypeError as ex:
         assert str(ex) == "Middleware mounted on a handler should be a function or a sequence of functions"
+