diff --git a/tests/test_plumbing.py b/tests/test_plumbing.py
index 3466d340..205e162c 100644
--- a/tests/test_plumbing.py
+++ b/tests/test_plumbing.py
@@ -21,7 +21,8 @@
 from drf_spectacular.openapi import AutoSchema
 from drf_spectacular.plumbing import (
     analyze_named_regex_pattern, build_basic_type, detype_pattern, follow_field_source,
-    force_instance, get_list_serializer, is_field, is_serializer, resolve_type_hint, build_choice_field,
+    force_instance, get_list_serializer, is_field, is_serializer, resolve_type_hint,
+    build_choice_field,
 )
 from drf_spectacular.validation import validate_schema
 from tests import generate_schema