Initial Test Suite

[ntno]

Description

• automated tests #13
• adds pytests which demonstrate how to unit test jinja2 macro (can be improved, but this is a start)
• fixed tile.j2 macro to pass added tests

Fixes

• img_alt defaults to empty string instead of no alt attribute
• width and height attributes default to no attribute instead of "auto" ("auto" is an invalid value for img width/height)

References

pytidylib
jinja2 test config: https://github.com/pallets/jinja/blob/main/tests/conftest.py
jinja2 tests: https://github.com/pallets/jinja/blob/main/tests/test_tests.py
pytidylib missing library issue
^having problems running pytidylib on windows, possibly related to something similar

Testing

make tox
review doc site with make serve-local-theme

• [x ] This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in mkdocs-terminal/documentation
• All active GitHub checks for tests, formatting, and security are passing