| Basically, I don't want to test for things I know.
Yes, you do. The edge/weird/invalid cases all need tests, but so do the standard simple cases. What this coverage (of the simple/known stuff) will do is ensure that the basic blocks don't change behavior. It also provides finer-grained resolution for debugging when tests fail -- for example if a weird edge case starts failing, you're going to assume it's because it's a weird edge case and the edge-case code has a problem, but what if it's because you tweaked a core function and it's just rearing it's head here? Good tests on that core function would point to that immediately.
As for your actual test-creation, my first thought is that I'm not sure you need (or want) to use WWW::Mechanize
(note also the existence of Test::WWW::Mechanize
) .. for one, it requires a web server running and is only needed for testing the gui screen functionality, but here it seems like you really want to get tests down for the back-end functionality.
For your actual individual tests, it seems like you need 1) input text 2) if the result against HTML::Lint
should be valid or invalid and optionally 3) a string to compare the result against
You can set that up in a data structure, and then iterate over it performming the tests...
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