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/api/v1/test_auth_endpoints.py

@@ -73,7 +73,9 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_register_duplicate_email(
-        self, test_client: AsyncClient, test_user: User,
+        self,
+        test_client: AsyncClient,
+        test_user: User,
     ) -> None:
         """Test registration with duplicate email."""
         user_data = {
@@ -128,7 +130,10 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_login_success(
-        self, test_client: AsyncClient, test_user: User, test_login_data: dict[str, str],
+        self,
+        test_client: AsyncClient,
+        test_user: User,
+        test_login_data: dict[str, str],
     ) -> None:
         """Test successful user login."""
         response = await test_client.post("/api/v1/auth/login", json=test_login_data)
@@ -161,7 +166,9 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_login_invalid_password(
-        self, test_client: AsyncClient, test_user: User,
+        self,
+        test_client: AsyncClient,
+        test_user: User,
     ) -> None:
         """Test login with invalid password."""
         login_data = {"email": test_user.email, "password": "wrongpassword"}
@@ -183,7 +190,10 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_get_current_user_success(
-        self, test_client: AsyncClient, test_user: User, auth_cookies: dict[str, str],
+        self,
+        test_client: AsyncClient,
+        test_user: User,
+        auth_cookies: dict[str, str],
     ) -> None:
         """Test getting current user info successfully."""
         # Set cookies on client instance to avoid deprecation warning
@@ -210,7 +220,8 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_get_current_user_invalid_token(
-        self, test_client: AsyncClient,
+        self,
+        test_client: AsyncClient,
     ) -> None:
         """Test getting current user with invalid token."""
         # Set invalid cookies on client instance
@@ -223,7 +234,9 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_get_current_user_expired_token(
-        self, test_client: AsyncClient, test_user: User,
+        self,
+        test_client: AsyncClient,
+        test_user: User,
     ) -> None:
         """Test getting current user with expired token."""
         from datetime import timedelta
@@ -237,7 +250,8 @@ class TestAuthEndpoints:
             "role": "user",
         }
         expired_token = JWTUtils.create_access_token(
-            token_data, expires_delta=timedelta(seconds=-1),
+            token_data,
+            expires_delta=timedelta(seconds=-1),
         )
 
         # Set expired cookies on client instance
@@ -262,7 +276,9 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_admin_access_with_user_role(
-        self, test_client: AsyncClient, auth_cookies: dict[str, str],
+        self,
+        test_client: AsyncClient,
+        auth_cookies: dict[str, str],
     ) -> None:
         """Test that regular users cannot access admin endpoints."""
         # This test would be for admin-only endpoints when they're created
@@ -293,7 +309,9 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_admin_access_with_admin_role(
-        self, test_client: AsyncClient, admin_cookies: dict[str, str],
+        self,
+        test_client: AsyncClient,
+        admin_cookies: dict[str, str],
     ) -> None:
         """Test that admin users can access admin endpoints."""
         from app.core.dependencies import get_admin_user
@@ -357,7 +375,8 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_oauth_authorize_invalid_provider(
-        self, test_client: AsyncClient,
+        self,
+        test_client: AsyncClient,
     ) -> None:
         """Test OAuth authorization with invalid provider."""
         response = await test_client.get("/api/v1/auth/invalid/authorize")
@@ -368,7 +387,9 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_oauth_callback_new_user(
-        self, test_client: AsyncClient, ensure_plans: tuple[Any, Any],
+        self,
+        test_client: AsyncClient,
+        ensure_plans: tuple[Any, Any],
     ) -> None:
         """Test OAuth callback for new user creation."""
         # Mock OAuth user info
@@ -400,7 +421,10 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_oauth_callback_existing_user_link(
-        self, test_client: AsyncClient, test_user: Any, ensure_plans: tuple[Any, Any],
+        self,
+        test_client: AsyncClient,
+        test_user: Any,
+        ensure_plans: tuple[Any, Any],
     ) -> None:
         """Test OAuth callback for linking to existing user."""
         # Mock OAuth user info with same email as test user
@@ -442,7 +466,8 @@ class TestAuthEndpoints:
 
     @pytest.mark.asyncio
     async def test_oauth_callback_invalid_provider(
-        self, test_client: AsyncClient,
+        self,
+        test_client: AsyncClient,
     ) -> None:
         """Test OAuth callback with invalid provider."""
         response = await test_client.get(