style: apply ruff formatting and move TYPE_CHECKING imports in tests

tests/test_decorator.py

@@ -14,7 +14,7 @@ Comprehensive tests covering:
 
 from __future__ import annotations
 
-from typing import AsyncGenerator
+from typing import TYPE_CHECKING
 
 import pytest
 from fastapi import FastAPI, Request
@@ -23,12 +23,15 @@ from httpx import ASGITransport, AsyncClient
 
 from fastapi_traffic import (
     MemoryBackend,
-    RateLimitExceeded,
     RateLimiter,
+    RateLimitExceeded,
     rate_limit,
 )
 from fastapi_traffic.core.limiter import set_limiter
 
+if TYPE_CHECKING:
+    from collections.abc import AsyncGenerator
+
 
 class TestRateLimitDecorator:
     """Tests for the @rate_limit decorator."""
@@ -175,9 +178,7 @@ class TestCustomKeyExtractor:
     ) -> None:
         """Test that different API keys have separate rate limits."""
         for _ in range(2):
-            response = await client.get(
-                "/by-api-key", headers={"X-API-Key": "key-a"}
-            )
+            response = await client.get("/by-api-key", headers={"X-API-Key": "key-a"})
             assert response.status_code == 200
 
         response = await client.get("/by-api-key", headers={"X-API-Key": "key-a"})
@@ -186,9 +187,7 @@ class TestCustomKeyExtractor:
         response = await client.get("/by-api-key", headers={"X-API-Key": "key-b"})
         assert response.status_code == 200
 
-    async def test_anonymous_key_for_missing_header(
-        self, client: AsyncClient
-    ) -> None:
+    async def test_anonymous_key_for_missing_header(self, client: AsyncClient) -> None:
         """Test that missing API key uses anonymous."""
         for _ in range(2):
             response = await client.get("/by-api-key")
@@ -255,8 +254,6 @@ class TestExemptionCallback:
         assert response.status_code == 429
 
 
-
-
 class TestCostParameter:
     """Tests for the cost parameter."""