Or maybe -- just maybe -- his problem domain might be harder to write tests for than yours is. Look, as one of the Rakudo Perl 6 developers, I love our extensi

Or maybe -- just maybe -- his problem domain might be harder to write tests for than yours is. Look, as one of the Rakudo Perl 6 developers, I love our extensive test suite. It's an absolutely terrific development tool. Writing tests for it is usually quite easy, helps make sure we're getting the subtle details and interactions correct, and benefits not just Rakudo but every Perl 6 project. It's a huge win. But I'm also working on a ABC music notation to sheet music program, using Perl 6 and Lilypond as tools. And I don't see how I could fully test the results of that without using some sort of optical sheet music recognition software -- and even if I could get that up and running, it would still only be testing that the musical symbols were correct, and not that the sheet music actually looked good. If you can tell me how to set up an automatic test for those things that will take me less time to setup than the 40 or so hours that writing the actual program took, I'm all ears.