Jorge Adriano Aires
Hello all, When using Quickcheck, is there some way to extract generated data values to the IO Monad?
I know I can collect and print information about test cases, but that's not enough. Data may be pretty complex, and there may be no parsers for it. If a test suddenly goes wrong, just having it displayed doesn't seem that useful.
You may be interested in a QuickCheck hack of mine that saves the offending data value to use immediately in the next test run. You can get the current version with "darcs get http://thunderbird.scannedinavian.com/repos/quickcheck" I've only used this for my own code, so I'd be interested in any feedback. In some cases it's a lot easier to generate a value from a seed and size rather than saving the value in some way that you can restore (ie functions). I've been investigating doing test-driven-development with QuickCheck, saving failing test cases is one step towards that goal. If you have more ideas on that topic, I'd like to hear about it.
Also, even when I'm implementing a generator, I want to see how it is working. Running a verboseCheck on some dummy property helps, but I may want to analyse the data, or some parts of it better - for instance, for many data structures I have alternative "show" functions that take parameters as arguments.
This isn't clear to me, can you give other examples? -- Shae Matijs Erisson - Programmer - http://www.ScannedInAvian.org/ "I will, as we say in rock 'n' roll, run until the wheels come off, because I love what I do." -- David Crosby