[ERROR] tests/requirements does not exist

I was trying the setup and stumbled upon an issue with inquiry about `tests/requirements.txt` directory/file

specifically, the following error:
ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'tests/requirements.txt'

Looks like the ref for such is stated in multiple places.

Start by searching the setup instructions and configuration for references to tests/requirements.txt, then reproduce the reported requirements-file error. Done means the setup no longer points to the missing path and the documented setup process completes successfully.

Written by the indexing model from the issue text.