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I'd second this comment. I took over a large and mostly monolithic application. At the time there were no test cases and so I went through and did two things at once:
Over time 99% of the code has been turned into objects and modules and now I have a good place to add more tests. Testing a large monolithic application is quite hard. Although if you can install an instance upon a test environment (perhaps along with a test database with contents, etc) you may be able to use the WWW::Mechanize family of modules to fire requests against it and parse the results back out. In reply to Re^2: Adding Tests to Mature Web App
by skx
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