The usual set of test scripts are "regression tests," designed to make sure that nothing breaks when changes are made to your module or it's installed on another machine. They should test basic functionality, things that are likely to be incompatible on other systems, and things that are likely to break as you're making changes. An important part of maintaining these tests is making sure that as you fix bugs, you add tests to make sure the bugs don't come back.

As for how thorough you want to make your tests, that's up to you. If your bounds checking is essential to your module or you think it's likely to break, check it; otherwise skip it.

For testing random scripts, srand can be useful to make sure that rand will always return the same sequence while testing. You can also call the function you're testing several times, and make sure the results are consistent and not all the same.

In reply to Re: writing tests on modules by sgifford
in thread writing tests on modules by arcnon

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