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I could see this being very useful for testing little scripts and even small c command line applications i have written.

In the case of the small command line applications this is probably the ideal way to test them. Obviously if the application is even remotely complex you will want unit tests too which probably should be implemented in the language (so you can test your procedures directly) but there is a case for integration tests as well.

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If you structure your program in a certain way, there's no need to distinguish between procedures and commands. See git and rbenv, which expose a single meta-command to your $PATH but are comprised internally of many smaller commands that invoke each other and communicate over standard I/O.

This is also known as the UNIX philosophy :)

I doubt that all of git commit is implemented in main. So I'm sure that there is still plenty of use for unit tests.

As a matter of fact, all automated tests of the Git project are powered by a shell-based TAP harness, which tests executable commands only.

To be fair, there are some dedicated C tools driving unit tests via CLI, but most of the tests are based on the final plumbing and porcelain commands.

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