Refactor test cases for improved readability and consistency

- Updated test functions in various test files to enhance code clarity by formatting long lines and improving indentation.
- Adjusted assertions to use multi-line formatting for better readability.
- Added new test cases for theme settings API to ensure proper functionality.
- Ensured consistent use of line breaks and spacing across test files for uniformity.

routes/consumption.py

@@ -36,7 +36,9 @@ class ConsumptionRead(ConsumptionBase):
     model_config = ConfigDict(from_attributes=True)
 
 
-@router.post("/", response_model=ConsumptionRead, status_code=status.HTTP_201_CREATED)
+@router.post(
+    "/", response_model=ConsumptionRead, status_code=status.HTTP_201_CREATED
+)
 def create_consumption(item: ConsumptionCreate, db: Session = Depends(get_db)):
     db_item = Consumption(**item.model_dump())
     db.add(db_item)