Add CLI tests #2
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Executing these tests requires that a `tpl` command is available in $PATH. This also lays the ground work for a lot more end-to-end tests of more features (advanced shadowing testing) and invocation methods (docker).
This is in line with the few BSD tools I tested. But they still print the version text to STDOUT, which is kind of weird.
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To lay the foundation to ensure equal invocation of the installed package, the copied zipapp and the docker image I added a small class that we can use as a fixture to easily test multiple argument combinations.
This also fixes that the help and usage information is now printed to STDERR because I noticed that was wrong while writing the tests.