diff --git a/tests/test_depends_limiter.py b/tests/test_depends_limiter.py
index f7e015b7e..9158a3bb1 100644
--- a/tests/test_depends_limiter.py
+++ b/tests/test_depends_limiter.py
@@ -1,18 +1,15 @@
 from contextlib import asynccontextmanager
-import threading
 
+import anyio
+import sniffio
 from fastapi import Depends, FastAPI
 from fastapi.testclient import TestClient
 from typing_extensions import Annotated
-import anyio
-import sniffio
 
 
 def get_borrowed_tokens():
-    return {
-        lname: l.borrowed_tokens
-        for lname, l in sorted(limiters.items())
-    }
+    return {lname: l.borrowed_tokens for lname, l in sorted(limiters.items())}
+
 
 def limited_dep():
     # run this in the event loop thread:
@@ -22,11 +19,12 @@ def limited_dep():
 
 def init_limiters():
     return {
-        'default': None, # should be set in Lifespan handler
-        'a': anyio.CapacityLimiter(5),
-        'b': anyio.CapacityLimiter(3),
+        "default": None,  # should be set in Lifespan handler
+        "a": anyio.CapacityLimiter(5),
+        "b": anyio.CapacityLimiter(3),
     }
 
+
 # Note:
 # initializing CapacityLimiters at module level before the event loop has started
 # needs anyio >= 4.2.0; starlette currently requires anyio >= 3.4.0
@@ -39,16 +37,18 @@ except sniffio.AsyncLibraryNotFoundError:
     # not in an async context yet
     async def _init_limiters():
         return init_limiters()
+
     limiters = anyio.run(_init_limiters)
 
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    limiters['default'] = anyio.to_thread.current_default_thread_limiter()
+    limiters["default"] = anyio.to_thread.current_default_thread_limiter()
     yield {
-        'limiters': limiters,
+        "limiters": limiters,
     }
 
+
 app = FastAPI(lifespan=lifespan)
 
 
@@ -56,70 +56,75 @@ app = FastAPI(lifespan=lifespan)
 async def root(borrowed_tokens: Annotated[dict, Depends(limited_dep)]):
     return borrowed_tokens
 
+
 @app.get("/a")
-async def a(borrowed_tokens: Annotated[dict, Depends(limited_dep, limiter=limiters['a'])]):
+async def a(
+    borrowed_tokens: Annotated[dict, Depends(limited_dep, limiter=limiters["a"])],
+):
     return borrowed_tokens
 
+
 @app.get("/b")
-async def b(borrowed_tokens: Annotated[dict, Depends(limited_dep, limiter=limiters['b'])]):
+async def b(
+    borrowed_tokens: Annotated[dict, Depends(limited_dep, limiter=limiters["b"])],
+):
     return borrowed_tokens
 
 
-
 def test_depends_limiter():
     with TestClient(app) as client:
         response = client.get("/")
         assert response.status_code == 200, response.text
-        assert response.json() == {"a":0,"b":0,"default":1}
+        assert response.json() == {"a": 0, "b": 0, "default": 1}
 
         response = client.get("/a")
         assert response.status_code == 200, response.text
-        assert response.json() == {"a":1,"b":0,"default":0}
+        assert response.json() == {"a": 1, "b": 0, "default": 0}
 
         response = client.get("/b")
         assert response.status_code == 200, response.text
-        assert response.json() == {"a":0,"b":1,"default":0}
+        assert response.json() == {"a": 0, "b": 1, "default": 0}
 
 
 def test_openapi_schema():
     with TestClient(app) as client:
         response = client.get("/openapi.json")
         assert response.status_code == 200, response.text
-        assert response.json()['paths'] == {
-            '/': {
-                'get': {
-                    'summary': 'Root',
-                    'operationId': 'root__get',
-                    'responses': {
-                        '200': {
-                            'description': 'Successful Response',
-                            'content': {'application/json': {'schema': {}}}
+        assert response.json()["paths"] == {
+            "/": {
+                "get": {
+                    "summary": "Root",
+                    "operationId": "root__get",
+                    "responses": {
+                        "200": {
+                            "description": "Successful Response",
+                            "content": {"application/json": {"schema": {}}},
                         }
-                    }
+                    },
                 }
             },
-            '/a': {
-                'get': {
-                    'summary': 'A',
-                    'operationId': 'a_a_get',
-                    'responses': {
-                        '200': {
-                            'description': 'Successful Response',
-                            'content': {'application/json': {'schema': {}}}
+            "/a": {
+                "get": {
+                    "summary": "A",
+                    "operationId": "a_a_get",
+                    "responses": {
+                        "200": {
+                            "description": "Successful Response",
+                            "content": {"application/json": {"schema": {}}},
                         }
-                    }
+                    },
                 }
             },
-            '/b': {
-                'get': {
-                    'summary': 'B',
-                    'operationId': 'b_b_get',
-                    'responses': {
-                        '200': {
-                            'description': 'Successful Response',
-                            'content': {'application/json': {'schema': {}}}
+            "/b": {
+                "get": {
+                    "summary": "B",
+                    "operationId": "b_b_get",
+                    "responses": {
+                        "200": {
+                            "description": "Successful Response",
+                            "content": {"application/json": {"schema": {}}},
                         }
-                    }
+                    },
                 }
-            }
+            },
         }