diff --git a/testing/code/test_code.py b/testing/code/test_code.py
index 31977c719..69b53d340 100644
--- a/testing/code/test_code.py
+++ b/testing/code/test_code.py
@@ -187,7 +187,7 @@ class TestReprFuncArgs:
 
 def test_getfslineno() -> None:
     def f(x) -> None:
-        pass
+        raise NotImplementedError()
 
     fspath, lineno = getfslineno(f)