test_template.py causes problems with PyTest

[PFython]

PyTest attempts to run the current template file test_template.py.

It might make sense to convert all templates to .template or .txt and also consider using the built-in method string.Template() for and ${replace_this} for substitutions.

The following article explains string.Template : https://florian-dahlitz.de/blog/generate-file-reports-using-pythons-template-class