## Summary
Attempting to fix a test which seems to be broken when integrated with https://dev.azure.com/ma-dev-uk/PrimAITE/_git/PrimAITE/pullrequest/160
## Test process
*How have you tested this (if applicable)?*
## Checklist
- [x] This PR is linked to a **work item**
- [x] I have performed **self-review** of the code
- [x] I have written **tests** for any new functionality added with this PR
- [ ] I have updated the **documentation** if this PR changes or adds functionality
- [ ] I have written/updated **design docs** if this PR implements new functionality.
- [x] I have run **pre-commit** checks for code style
#1714: fixing minor error in test + adding a check for existing uuid when adding file
Related work items: #1714
d972fcc07e