Add comprehensive tests for playlist service and refactor socket service tests

- Introduced a new test suite for the PlaylistService covering various functionalities including creation, retrieval, updating, and deletion of playlists.
- Added tests for handling sounds within playlists, ensuring correct behavior when adding/removing sounds and managing current playlists.
- Refactored socket service tests for improved readability by adjusting function signatures.
- Cleaned up unnecessary whitespace in sound normalizer and sound scanner tests for consistency.
- Enhanced audio utility tests to ensure accurate hash and size calculations, including edge cases for nonexistent files.
- Removed redundant blank lines in cookie utility tests for cleaner code.

tests/services/test_auth_service.py

@@ -48,11 +48,15 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_register_duplicate_email(
-        self, auth_service: AuthService, test_user: User,
+        self,
+        auth_service: AuthService,
+        test_user: User,
     ) -> None:
         """Test registration with duplicate email."""
         request = UserRegisterRequest(
-            email=test_user.email, password="password123", name="Another User",
+            email=test_user.email,
+            password="password123",
+            name="Another User",
         )
 
         with pytest.raises(HTTPException) as exc_info:
@@ -89,7 +93,8 @@ class TestAuthService:
     async def test_login_invalid_email(self, auth_service: AuthService) -> None:
         """Test login with invalid email."""
         request = UserLoginRequest(
-            email="nonexistent@example.com", password="password123",
+            email="nonexistent@example.com",
+            password="password123",
         )
 
         with pytest.raises(HTTPException) as exc_info:
@@ -100,7 +105,9 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_login_invalid_password(
-        self, auth_service: AuthService, test_user: User,
+        self,
+        auth_service: AuthService,
+        test_user: User,
     ) -> None:
         """Test login with invalid password."""
         request = UserLoginRequest(email=test_user.email, password="wrongpassword")
@@ -113,7 +120,10 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_login_inactive_user(
-        self, auth_service: AuthService, test_user: User, test_session: AsyncSession,
+        self,
+        auth_service: AuthService,
+        test_user: User,
+        test_session: AsyncSession,
     ) -> None:
         """Test login with inactive user."""
         # Store the email before deactivating
@@ -133,7 +143,10 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_login_user_without_password(
-        self, auth_service: AuthService, test_user: User, test_session: AsyncSession,
+        self,
+        auth_service: AuthService,
+        test_user: User,
+        test_session: AsyncSession,
     ) -> None:
         """Test login with user that has no password hash."""
         # Store the email before removing password
@@ -153,7 +166,9 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_get_current_user_success(
-        self, auth_service: AuthService, test_user: User,
+        self,
+        auth_service: AuthService,
+        test_user: User,
     ) -> None:
         """Test getting current user successfully."""
         user = await auth_service.get_current_user(test_user.id)
@@ -174,7 +189,10 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_get_current_user_inactive(
-        self, auth_service: AuthService, test_user: User, test_session: AsyncSession,
+        self,
+        auth_service: AuthService,
+        test_user: User,
+        test_session: AsyncSession,
     ) -> None:
         """Test getting current user when user is inactive."""
         # Store the user ID before deactivating
@@ -192,7 +210,9 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_create_access_token(
-        self, auth_service: AuthService, test_user: User,
+        self,
+        auth_service: AuthService,
+        test_user: User,
     ) -> None:
         """Test access token creation."""
         token_response = auth_service._create_access_token(test_user)
@@ -211,7 +231,10 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_create_user_response(
-        self, auth_service: AuthService, test_user: User, test_session: AsyncSession,
+        self,
+        auth_service: AuthService,
+        test_user: User,
+        test_session: AsyncSession,
     ) -> None:
         """Test user response creation."""
         # Ensure plan relationship is loaded