Re: [Haskell-beginners] QuickCheck properties on monadic values

Rahul's solution requires QC2, so do cabal install QuickCheck-2.1.0.3. /Jonas On 21 May 2010 20:27, Rahul Kapoor wrote:

Ashish

Test.QuickCheck.Monadic should give you the building blocks you need.

For example here is a snippet which turns a value and a function of type a -> IO a into a regular property.

import Test.QuickCheck.Monadic (monadicIO, assert, run, pick) .. .. propIO :: Show a => Gen a -> (a -> IO Bool) -> Property propIO gen prop = monadicIO $ do                    v <- pick gen                    b <- run $ prop v                    assert b

You can find some examples of madic quick check properties at: http://github.com/trie/yay/blob/master/tests/Syck.hs

HTH, Rahul

On Fri, May 21, 2010 at 12:47 PM, Ashish Agarwal wrote:

...

I've been using the binary library, and would like to test whether my put and get functions are inverses. I thought of using QuickCheck but it is not clear how I can write the necessary property. I skimmed Claessen, Hughes, "Testing monadic code with QuickCheck", but their examples require a lot of extra work (e.g. their queue example requires an AST for a mini-queue language). Am I missing something obvious? Also, what's the difference between QuickCheck 1 and 2? I'm on gch 6.10 and doing `cabal install QuickCheck` gives me version 1.2.0.0, which lacks constructs described in the above paper. Thanks.

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