[Haskell-cafe] quickCheck problem

Ozgur Akgun ozgurakgun at gmail.com
Wed Oct 7 18:33:32 UTC 2015

On 7 October 2015 at 19:25, Rogan Creswick <creswick at gmail.com> wrote:

> Then I'd suggest using the quickcheck property guards ( `==>`) to only
> generate inputs that are known to be equal, or not equal and test
> separately in a few different properties.

This is not true, ==> still does generate and test.

Prelude> import Test.QuickCheck
Prelude Test.QuickCheck> let f x = x == 13 ==> mod x 2 == 1
Prelude Test.QuickCheck> quickCheck f
*** Gave up! Passed only 6 tests.

Also try verboseCheck to see what values are generated.

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