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Add UI test
We should consider using UI tests to the CI/tests ala snapbox or trycmd
this would help catch unexpected changes to output that don't necessarily cause the build to error.
~~I think assert_cmd might be the proper tool for the job here: https://crates.io/crates/assert_cmd~~
Edit: trycmd is probably better, and I'll try to configure it entirely tomorrow.
I think some variant of this should be finished prior to 0.3.0, just to avoid any regressions during our next release.