diff --git a/tests/test_custom_api.py b/tests/test_custom_api.py
index 122a0116b..147db0beb 100644
--- a/tests/test_custom_api.py
+++ b/tests/test_custom_api.py
@@ -2,12 +2,13 @@
 自定义API测试
 这是一个示例测试文件，展示如何在FastAPI项目中编写测试
 """
+
+from typing import Optional
+
 import pytest
 from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from pydantic import BaseModel
-from typing import Optional
-
 
 # 创建一个简单的FastAPI应用用于测试
 app = FastAPI()
@@ -53,32 +54,28 @@ client = TestClient(app)
 # 测试用例
 class TestCustomAPI:
     """自定义API测试类"""
-    
+
     def test_read_root(self):
         """测试根路径"""
         response = client.get("/")
         assert response.status_code == 200
         assert response.json() == {"message": "Hello Custom API"}
-    
+
     def test_read_item_with_params(self):
         """测试带参数的商品查询"""
         response = client.get("/items/5?q=somequery")
         assert response.status_code == 200
         assert response.json() == {"item_id": 5, "q": "somequery"}
-    
+
     def test_read_item_without_params(self):
         """测试不带查询参数的商品查询"""
         response = client.get("/items/10")
         assert response.status_code == 200
         assert response.json() == {"item_id": 10, "q": None}
-    
+
     def test_create_item(self):
         """测试创建商品"""
-        item_data = {
-            "name": "Test Item",
-            "price": 99.99,
-            "is_offer": True
-        }
+        item_data = {"name": "Test Item", "price": 99.99, "is_offer": True}
         response = client.post("/items/", json=item_data)
         assert response.status_code == 200
         response_data = response.json()
@@ -86,35 +83,38 @@ class TestCustomAPI:
         assert response_data["item"]["name"] == "Test Item"
         assert response_data["item"]["price"] == 99.99
         assert response_data["item"]["is_offer"] is True
-    
+
     def test_get_user(self):
         """测试获取用户信息"""
         response = client.get("/users/123")
         assert response.status_code == 200
         assert response.json() == {"user_id": 123, "username": "user_123"}
-    
-    @pytest.mark.parametrize("item_id,expected_id", [
-        (1, 1),
-        (42, 42),
-        (999, 999),
-    ])
+
+    @pytest.mark.parametrize(
+        "item_id,expected_id",
+        [
+            (1, 1),
+            (42, 42),
+            (999, 999),
+        ],
+    )
     def test_read_item_parametrized(self, item_id, expected_id):
         """参数化测试：测试不同的商品ID"""
         response = client.get(f"/items/{item_id}")
         assert response.status_code == 200
         assert response.json()["item_id"] == expected_id
-    
+
     def test_invalid_item_id(self):
         """测试无效的商品ID"""
         response = client.get("/items/not_a_number")
         assert response.status_code == 422  # 验证错误
-    
+
     def test_create_item_invalid_data(self):
         """测试创建商品时的无效数据"""
         invalid_data = {
             "name": "Test Item",
             # 缺少必需的price字段
-            "is_offer": True
+            "is_offer": True,
         }
         response = client.post("/items/", json=invalid_data)
         assert response.status_code == 422  # 验证错误
@@ -139,11 +139,7 @@ def test_openapi_schema():
 @pytest.fixture
 def sample_item():
     """测试用的示例商品数据"""
-    return {
-        "name": "Sample Item",
-        "price": 50.0,
-        "is_offer": False
-    }
+    return {"name": "Sample Item", "price": 50.0, "is_offer": False}
 
 
 def test_with_fixture(sample_item):