diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index 5de25ca4c..e1cab1863 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -14,7 +14,7 @@ from ipaddress import (
 from pathlib import Path, PurePath
 from re import Pattern
 from types import GeneratorType
-from typing import Any, Callable, Dict, List, Optional, Tuple, Type, Union
+from typing import Any, Callable, Dict, Optional, Tuple, Type, Union
 from uuid import UUID
 
 from fastapi.types import IncEx
@@ -102,6 +102,7 @@ encoders_by_class_tuples = generate_encoders_by_class_tuples(ENCODERS_BY_TYPE)
 
 NoneType = type(None)
 
+
 def jsonable_encoder(
     obj: Annotated[
         Any,
diff --git a/tests/test_jsonable_encoder.py b/tests/test_jsonable_encoder.py
index 6b1b744eb..4d805c561 100644
--- a/tests/test_jsonable_encoder.py
+++ b/tests/test_jsonable_encoder.py
@@ -102,21 +102,20 @@ def test_encode_dict_with_nonprimative_keys():
             return hash(self.value)
 
     assert jsonable_encoder(
-        {CustomString("foo"): "bar"},
-        custom_encoder={CustomString: lambda v: v.value}
+        {CustomString("foo"): "bar"}, custom_encoder={CustomString: lambda v: v.value}
     ) == {"foo": "bar"}
 
+
 def test_encode_dict_with_custom_encoder_keys():
     assert jsonable_encoder(
-        {"foo": "bar"},
-        custom_encoder={str: lambda v: "_" + v}
+        {"foo": "bar"}, custom_encoder={str: lambda v: "_" + v}
     ) == {"_foo": "_bar"}
 
 
 def test_encode_dict_with_sqlalchemy_safe():
     obj = {"_sa_foo": "foo", "bar": "bar"}
     assert jsonable_encoder(obj, sqlalchemy_safe=True) == {"bar": "bar"}
-    assert jsonable_encoder(obj, sqlalchemy_safe=False ) == obj
+    assert jsonable_encoder(obj, sqlalchemy_safe=False) == obj
 
 
 def test_encode_dict_with_exclude_none():