Refactor test cases for improved readability and consistency

- Adjusted function signatures in various test files to enhance clarity by aligning parameters.
- Updated patching syntax for better readability across test cases.
- Improved formatting and spacing in test assertions and mock setups.
- Ensured consistent use of async/await patterns in async test functions.
- Enhanced comments for better understanding of test intentions.

app/api/v1/playlists.py

@@ -2,7 +2,7 @@
 
 from typing import Annotated
 
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, HTTPException, status
 from sqlmodel.ext.asyncio.session import AsyncSession
 
 from app.core.database import get_db
@@ -110,7 +110,7 @@ async def update_playlist(
             status_code=status.HTTP_401_UNAUTHORIZED,
             detail="User ID not available",
         )
-    
+
     playlist = await playlist_service.update_playlist(
         playlist_id=playlist_id,
         user_id=current_user.id,