[R-pkg-devel] Hedgehog property based testing

Huw Campbell huw.campbell at gmail.com
Fri Feb 9 14:38:50 CET 2018

Hi all,

I have ported hedgehog, a property based testing library
<https://github.com/hedgehogqa/r-hedgehog> from Haskell to R, and would
really like folks to use it and test the API hard before I release it on
CRAN. I have been using it with great success for my projects for a while;
and have also uncovered a few real bugs in R libraries in the wild.

Hedgehog is similar to *quickcheck* in philosophy and fully compatible with
Hadley Wickham's *testthat* library, so should be easy to integrate. The
idea is to write property tests like this:

test_that("Reverse of reverse is identity",
  forall(gen.c(gen.element(1:100)), function(xs) expect_equal(rev(rev(xs)), xs))

Give it a shot and please do hit me up with any questions.

For all that I like about R, I think it can be tough to write robust
code which handles all the edge
cases one could throw at it, so great testing is invaluable.


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