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https://github.com/kward/shunit2 is your friend here.
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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There's Bat for automated bash testing. Used it a couple of times! https://github.com/bats-core/bats-core
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not sure about unit/functional testing, but https://www.shellcheck.net/ is handy for linting and finding bad practice.
NOTE:
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Hence, a higher number means a more popular project.