rodrigo.bonifacio at uol.com.br
Sun Mar 16 13:42:30 EDT 2008
I'm trying to use the quick-check library for checking some properties of a user defined data type. Bellow the target data type:
data Feature =
Feature Id Name FeatureType GroupType Children Properties |
Id = String
Name = String
FeatureType = int
GroupType = int
Children = [Feature]
Propertyes = [String]
I've written the following quick-check property:
prop_AlternativeFeature :: Feature -> Feature -> QuickCheck.Property
prop_AlternativeFeature fm fc = length (children fc) == 0 ==> length (checkAlternativeFeature fm fc) > 0
When I try to check such property, the result is:
ERROR "./EshopModelChecking.hs":11 - Type error in instance member binding
*** Term : arbitrary
*** Type : Feature
*** Does not match : Gen Feature
I think that I need to write some arbitrary or generator functions, but I didn't realize how to do that with the availalble quick-checking documentation.
Any help will be welcome.
Thanks in advance.
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