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This patch adds a simple pytest suite in the new dir 'tests'. It uses the handy "CliRunner" in the click.testing package to run each command as it would be run on the command line.
The tests simply assert that each command succeeds.
Added a tox.ini, so you can use 'tox' (pip install tox) to build and run in fresh virtual environment in one command (the command is ... wait for it ... tox).