Refactor user endpoint tests to include pagination and response structure validation

- Updated tests for listing users to validate pagination and response format.
- Changed mock return values to include total count and pagination details.
- Refactored user creation mocks for clarity and consistency.
- Enhanced assertions to check for presence of pagination fields in responses.
- Adjusted test cases for user retrieval and updates to ensure proper handling of user data.
- Improved readability by restructuring mock definitions and assertions across various test files.

app/models/base.py

@@ -20,7 +20,9 @@ class BaseModel(SQLModel):
 # SQLAlchemy event listener to automatically update updated_at timestamp
 @event.listens_for(BaseModel, "before_update", propagate=True)
 def update_timestamp(
-    mapper: Mapper[Any], connection: Connection, target: BaseModel,  # noqa: ARG001
+    mapper: Mapper[Any],  # noqa: ARG001
+    connection: Connection,  # noqa: ARG001
+    target: BaseModel,
 ) -> None:
     """Automatically set updated_at timestamp before update operations."""
     target.updated_at = datetime.now(UTC)

app/models/playlist_sound.py

@@ -35,5 +35,3 @@ class PlaylistSound(BaseModel, table=True):
     # relationships
     playlist: "Playlist" = Relationship(back_populates="playlist_sounds")
     sound: "Sound" = Relationship(back_populates="playlist_sounds")
-
-