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/core/test_api_token_dependencies.py

@@ -36,7 +36,9 @@ class TestApiTokenDependencies:
 
     @pytest.mark.asyncio
     async def test_get_current_user_api_token_success(
-        self, mock_auth_service, test_user,
+        self,
+        mock_auth_service,
+        test_user,
     ):
         """Test successful API token authentication."""
         mock_auth_service.get_user_by_api_token.return_value = test_user
@@ -46,7 +48,9 @@ class TestApiTokenDependencies:
         result = await get_current_user_api_token(mock_auth_service, api_token_header)
 
         assert result == test_user
-        mock_auth_service.get_user_by_api_token.assert_called_once_with("test_api_token_123")
+        mock_auth_service.get_user_by_api_token.assert_called_once_with(
+            "test_api_token_123"
+        )
 
     @pytest.mark.asyncio
     async def test_get_current_user_api_token_no_header(self, mock_auth_service):
@@ -94,7 +98,9 @@ class TestApiTokenDependencies:
 
     @pytest.mark.asyncio
     async def test_get_current_user_api_token_expired_token(
-        self, mock_auth_service, test_user,
+        self,
+        mock_auth_service,
+        test_user,
     ):
         """Test API token authentication with expired token."""
         # Set expired token
@@ -111,7 +117,9 @@ class TestApiTokenDependencies:
 
     @pytest.mark.asyncio
     async def test_get_current_user_api_token_inactive_user(
-        self, mock_auth_service, test_user,
+        self,
+        mock_auth_service,
+        test_user,
     ):
         """Test API token authentication with inactive user."""
         test_user.is_active = False
@@ -126,9 +134,13 @@ class TestApiTokenDependencies:
         assert "Account is deactivated" in exc_info.value.detail
 
     @pytest.mark.asyncio
-    async def test_get_current_user_api_token_service_exception(self, mock_auth_service):
+    async def test_get_current_user_api_token_service_exception(
+        self, mock_auth_service
+    ):
         """Test API token authentication with service exception."""
-        mock_auth_service.get_user_by_api_token.side_effect = Exception("Database error")
+        mock_auth_service.get_user_by_api_token.side_effect = Exception(
+            "Database error"
+        )
 
         api_token_header = "test_token"
 
@@ -140,7 +152,9 @@ class TestApiTokenDependencies:
 
     @pytest.mark.asyncio
     async def test_get_current_user_flexible_uses_api_token(
-        self, mock_auth_service, test_user,
+        self,
+        mock_auth_service,
+        test_user,
     ):
         """Test flexible authentication uses API token when available."""
         mock_auth_service.get_user_by_api_token.return_value = test_user
@@ -149,11 +163,15 @@ class TestApiTokenDependencies:
         access_token = "jwt_token"
 
         result = await get_current_user_flexible(
-            mock_auth_service, access_token, api_token_header,
+            mock_auth_service,
+            access_token,
+            api_token_header,
         )
 
         assert result == test_user
-        mock_auth_service.get_user_by_api_token.assert_called_once_with("test_api_token_123")
+        mock_auth_service.get_user_by_api_token.assert_called_once_with(
+            "test_api_token_123"
+        )
 
     @pytest.mark.asyncio
     async def test_get_current_user_flexible_falls_back_to_jwt(self, mock_auth_service):
@@ -165,7 +183,9 @@ class TestApiTokenDependencies:
             await get_current_user_flexible(mock_auth_service, "jwt_token", None)
 
     @pytest.mark.asyncio
-    async def test_api_token_no_expiry_never_expires(self, mock_auth_service, test_user):
+    async def test_api_token_no_expiry_never_expires(
+        self, mock_auth_service, test_user
+    ):
         """Test API token with no expiry date never expires."""
         test_user.api_token_expires_at = None
         mock_auth_service.get_user_by_api_token.return_value = test_user