Top 7 Haskell property-testing Projects

hedgehog

3 661 6.0 Haskell

Release with confidence, state-of-the-art property testing for Haskell.
smallcheck

3 133 4.2 Haskell

Test your Haskell code by exhaustively checking its properties

Project mention: Generating Well-Typed Terms that are not "Useless" [pdf] | news.ycombinator.com | 2023-10-27

Using laziness to avoid generating parts of an expression until it's needed is a really nice idea. The LazySmallCheck package[1] took this approach, but was limited in the types of data it could produce (e.g. it couldn't generate functions). This was extended by LazySmallCheck2012[2], but that seems to be unmaintained and doesn't work with more recent GHC versions.
(Note that these are named in reference to SmallCheck[3], which takes the approach of enumerating concrete values in order of "size"; as an alternative to the more widely-used QuickCheck[4], which generates concrete values at random, and tries to "shrink" those which trigger a failure)
[1] https://hackage.haskell.org/package/lazysmallcheck
[2] https://github.com/UoYCS-plasma/LazySmallCheck2012
[3] https://hackage.haskell.org/package/smallcheck
[4] https://hackage.haskell.org/package/QuickCheck

InfluxDB

www.influxdata.com sponsored

Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
fitspec

0 74 6.7 Haskell

refine properties for testing Haskell programs
leancheck

5 51 8.6 Haskell

enumerative property-based testing for Haskell

Project mention: Help with stack ghci and LeanCheck | /r/haskell | 2023-12-11

Hey, I am an IT student, and was given the task to install Leancheck. I managed to do that by following the instructions on: https://github.com/rudymatela/leancheck/blob/master/README.md Now it works if I do "ghci" and then "import Test.LeanCheck".

speculate

0 30 9.0 Haskell

Speculate laws about Haskell functions
hedgehog-gen

0 1 0.0 Haskell

Customizable Gen for ADT using Generics
leancheck-instances

0 1 6.5 Haskell

Common LeanCheck instances
WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).