quickcheck Questions
2
Solved
While installing the QuickCheck for Haskell GHC 7.8.3 on a OS X Yosemite 10.10 (14A389) system running on a Mac Pro 2013 with Xcode 6.1 (6A1052d), I'm running into the following clang error:
$ ca...
Tophus asked 24/10, 2014 at 15:32
2
Solved
Suppose I have a record type:
data Foo = Foo {x, y, z :: Integer}
A neat way of writing an Arbitrary instance uses Control.Applicative like this:
instance Arbitrary Foo where
arbitrary = Foo &...
Winy asked 22/12, 2012 at 19:44
2
In various more functional based languages there are tools (like Quickcheck) which allow for property based testing.
How would I go about property based testing in PHP?
I would like to be able to s...
Tapestry asked 17/5, 2011 at 8:35
2
Solved
I'm trying to use QuickCheck following another answer.
I test like this:
{-# LANGUAGE TemplateHaskell #-}
import Test.QuickCheck
import Test.QuickCheck.All
last' :: [a] -> a
last' [x] = x
last...
Languorous asked 6/2, 2015 at 4:25
2
Solved
I'm trying to solve the same exercise as this other question in Chapter 15 of "Haskell Programming from First Principles". I've already made a Semigroup instance, and I'm having trouble writing the...
Tseng asked 27/12, 2016 at 18:18
1
Solved
I'm playing with FsCheck so I have this implementation:
let add a b =
if a > 100
then failwith "nasty bug"
else a + b
...and this FsCheck based test:
fun (a:int) -> (add a 0) = a
|>...
Sverige asked 14/11, 2016 at 14:36
1
Solved
I've got a protocol that I've typed like so:
data ProtocolPacket
= Packet1 Word8 Text Int8
| Packet2 Text
| Packet3 Int Text Text Text Text
| Packet4 Int Double Double Double Int16 Int16 Int16...
Spoliation asked 15/6, 2016 at 18:29
3
Solved
What is the general term for a functor with a structure resembling QuickCheck's promote function, i.e., a function of the form:
promote :: (a -> f b) -> f (a -> b)
(this is the inverse ...
Godden asked 8/10, 2014 at 18:58
1
Solved
We have two functions that compare two different power functions, and return true if they return the same value (on the same input).
Then we have two other functions that test these functions agai...
Zamboanga asked 2/9, 2016 at 11:39
3
Solved
I have a property that takes a list of Strings:
myProp :: [String] -> Bool
I need to constrain the inputs that QuickCheck generates so that only non-empty strings are in the list.
How can I d...
Plugugly asked 4/2, 2015 at 19:1
3
Solved
I'm new to Haskell. It's very nice so far, but I'm running into copy-pasting for my QuickCheck properties, and I'd like to fix that.
Here's a made-up example:
prop_Myfunc :: [Int] -> (Int,Int)...
Coorg asked 27/11, 2014 at 13:34
3
Solved
I need to test a lot of functions that access the database (via Persistent). While I can do this using monadicIO and withSqlitePool it will result in inefficient tests. Each test, not property, but...
Implant asked 28/7, 2016 at 19:5
0
In my project, I have several QuickCheck properties, most of which I collect using forAllProperties, defined in Test.QuickCheck.All. I am trying to run all my properties in parallel which is provin...
Brabble asked 13/5, 2016 at 21:23
1
Solved
Checkers is a library for reusable QuickCheck properties, particularly for
standard type classes
How do I write a checkers instance to test whether my applicative instance of Validation is val...
Ender asked 15/3, 2016 at 10:59
2
Solved
Okay, as I learned via my previous question, the RWH book is already out of date for QuickCheck. And despite all the posts I've read that tell me how incredibly simple it is to use QuickCheck, I ca...
Keyek asked 14/11, 2011 at 1:12
2
Solved
I tried following the Introduction to Quickcheck and wanted to test my function which takes strings containing of digits. For that, I defined an Arbitrary instance for Char:
instance Arbitrary Cha...
Salvage asked 11/4, 2015 at 12:25
2
I've just written a function (for Data.Sequence)
traverseWithIndex :: Applicative f => (Int -> a -> f b) -> Seq a -> f (Seq b)
which should obey
traverseWithIndex f = sequenceA ....
Odont asked 21/1, 2016 at 19:21
2
Solved
A number of years ago a Java testing tool called Agitar was popular. It appeared to do something like property based testing.
Nowadays - property based testing based on Haskell's Quickcheck is po...
Elroyels asked 28/3, 2014 at 12:31
7
Solved
I am looking for a Java tool that would create anonymous variables (variables whose value I don't care about) in my tests, similar to AutoFixture in .Net. Here is a link to AutoFixture's read...
Hypogastrium asked 6/7, 2012 at 17:56
1
Solved
Suppose I have a function that should calculate some value in one case and
throw an exception otherwise. I would like to use QuickCheck to ensure my
function behaves correctly, however is not obvio...
Eveland asked 31/10, 2015 at 11:59
1
Solved
Given the following:
test :: (Int -> Int) -> Int -> Bool
test _ _ = True
After compiling the source, I try to run quickCheck test:
> quickCheck test
<interactive>:27:1:
No in...
Worm asked 22/9, 2015 at 2:27
2
Given an arbitrary tree, I can construct a subtype relation over that tree, using Schubert numbering:
constructH :: Tree a -> Tree (Type a)
where Type nests the original label, and additional...
Instead asked 3/12, 2013 at 13:40
1
Solved
In Testing Monadic Code with QuickCheck (Claessen, Hughes 2002), assert has the type:
assert :: (Monad m, Testable a) => a -> PropertyM m ()
However, in Test.QuickCheck.Monadic, it has the...
Murraymurre asked 29/7, 2015 at 13:29
1
Solved
I have two generators, gen_n & gen_arr:
gen_n :: Gen Int
gen_n = suchThat arbitrary (\i -> i >= 0 && i <= 10)
gen_elem :: Gen Int
gen_elem = suchThat arbitrary (\i -> i &g...
Cosmopolis asked 29/7, 2015 at 14:51
2
I'd like to know what is the property testing aiming for, what is it's sweet point, where it should be used. Let' have an example function that I want to test:
f :: [Integer] -> [Integer]
Thi...
Overcoat asked 16/5, 2015 at 10:30
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