Please remove all the negative implying variables.

https://github.com/FNNDSC/ChRIS_ultron_backEnd/blame/master/chris_backend/collectionjson/tests/test_renderers.py#L20


<img width="1274" height="748" alt="Image" src="https://github.com/user-attachments/assets/d4cc9c8a-5288-4c3a-9267-5f441e81e807" />


I believe these variables are not allowed by BCH/FNNDSC standard.
