quickcheck | Randomized testing for R | Testing library
kandi X-RAY | quickcheck Summary
kandi X-RAY | quickcheck Summary
This package provides support for randomized software testing for R. Inspired by its influential [Haskell namesake] it promotes a style of writing tests where assertions about functions are verified on random inputs. The package provides default generators for most common types but allows users to modify their behavior or even to create new ones based on the needs of a each application. The main advantages over traditional testing are. Additional features include the repro function that supports reproducing and debugging a failed test. For additional information, see the [tutorial] docs/tutorial.md). For support, we are [monitoring] tags [R] [quickcheck] on [Stackoverflow] Please remember to add both tags to your question. For new releases, subscribe to quickcheck's Release notes [feed] or by [email] To install, first install and load devtools.
Support
Quality
Security
License
Reuse
Top functions reviewed by kandi - BETA
Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of quickcheck
quickcheck Key Features
quickcheck Examples and Code Snippets
Community Discussions
Trending Discussions on quickcheck
QUESTION
I'm following haskellbook.com and there is an exercise for QuickCheck, long history short I can't figure out how to implement a instance for arbitrary for my type because it has a parametric type
Here is the code
...ANSWER
Answered 2021-Jun-04 at 03:18What you want to do is use the Arbitrary instance for a. I can tell you know you need to do this because you already added Arbitrary a as a constraint to the instance, but you need to actually use it. For instance:
QUESTION
I have two functions. They are:
...ANSWER
Answered 2021-May-26 at 23:52Specify that your function should be tested on e.g. lists of ints:
QUESTION
I roll my own elem function called elem'
ANSWER
Answered 2021-May-26 at 06:43This happens because Haskell thinks that you're constraining the return type of the lambda expression \a->(\xs->((elem' a xs)==(elem a xs))). This may be easier to see if you format the expression a bit more idiomatically:
QUESTION
I generally use the pytest.mark.parametrize decorator when writing unit
tests. It occurred to me that when testing functions that raise exceptions, I
could do something like the following:
bar.py:
ANSWER
Answered 2021-May-16 at 12:10The best practice for tests (in every language btw) is that every test should test one and only thing.
Every single test should be specific. You can know if your test is specific enough by the name of the test. If you fall into a test name like "test_foo_works" (like your test) you can infer that this test is too generic. Therefore needs to be split.
Your test can be splited into "test_valid_foo_inputs" and "test_invalid_foo_inputs"
In your example, you abused the parametrize annotation.
Pytest provides the parametrize for multiple parameters of the same purpose. (Like multiple valid/invalid foo inputs).
QUESTION
Using the generics-sop library, I have the following function:
ANSWER
Answered 2021-May-05 at 15:31{-# LANGUAGE FlexibleContexts, FlexibleInstances, DataKinds, MultiParamTypeClasses, RankNTypes, ScopedTypeVariables, TypeApplications #-}
import Data.Proxy
import Data.SOP
import Data.SOP.NP
f :: forall m ref xs. (Applicative m, All (C ref) xs) => (forall b. m (ref b)) -> m (NP I xs)
f act = sequence_NP (cpure_NP (Proxy @(C ref)) act)
-- C ref a: "there exists b such that (a ~ ref b)"
-- We can actually define b using the following type family:
type family Snd a where
Snd (f a) = a
class (a ~ ref (Snd a)) => C ref a
instance (a ~ ref (Snd a)) => C ref a
-- Example
f2 :: Applicative m => (forall b. m (ref b)) -> m (NP I '[ref a1, ref a2])
f2 = f
QUESTION
I wrote this function
...ANSWER
Answered 2021-Apr-19 at 10:50I changed hackage regex-pcre-builtin to light-pcre. And it works !
I haved to encode my strings into ut8 bytestring then add utf8 compile-time flag
QUESTION
I am using the Real World Haskell book. The statement
...ANSWER
Answered 2021-Mar-28 at 00:16One key part of the error message you got is here:
QUESTION
I'm wondering if there's some way to prevent functions from printing to the terminal when they're being tested through GHCI with QuickCheck and monadicIO.
For example, say I have the following code:
...ANSWER
Answered 2021-Feb-07 at 06:08As bradrn commented, this can be done using the silently package. Just apply your function as an argument to its silence function:
QUESTION
Based on the suggestion at Haskell quickBatch: Testing ZipList Monoid at mconcat results in stack overflow,
and some solutions at How can I constrain a QuickCheck parameter to a list of non-empty Strings?,
I've not been able to make this code workable:
...ANSWER
Answered 2021-Jan-24 at 14:53When you write
QUESTION
In our CS-Lectures we currently learn about QuickCheck in Haskell. Now I got a task to use QuickCheck with the following tree-type:
...ANSWER
Answered 2021-Jan-18 at 15:25The simplest way to implement this is with:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install quickcheck
Support
Reuse Trending Solutions
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from over 650 million Knowledge Items
Find more librariesStay Updated
Subscribe to our newsletter for trending solutions and developer bootcamps
Share this Page
