diff --git a/testing/python/fixtures.py b/testing/python/fixtures.py
index 66a5daf50..9781bd265 100644
--- a/testing/python/fixtures.py
+++ b/testing/python/fixtures.py
@@ -4368,7 +4368,11 @@ def test_fixture_double_decorator(pytester: Pytester) -> None:
     )
     result = pytester.runpytest()
     result.assert_outcomes(errors=1)
-    result.stdout.fnmatch_lines(["E * ValueError: @pytest.fixture is being applied more than once to the same function 'fixt'"])
+    result.stdout.fnmatch_lines(
+        [
+            "E * ValueError: @pytest.fixture is being applied more than once to the same function 'fixt'"
+        ]
+    )
 
 
 def test_fixture_param_shadowing(pytester: Pytester) -> None: