add tests

[LangLangBart]

description

• to avoid testing the same things over and over again, add some tests
  • Ref: dodie/testing-in-bash

[pcrockett]

that link looks like a great resource, looks super comprehensive.

for what it's worth, i've had success using plain bats (no plugins) with a minimal util.sh. can recommend a similar approach. it's effective, with minimal learning curve.

real-life example: https://github.com/pcrockett/gramps/tree/main/tests

run tests simply with bats tests