[Haskell-cafe] doctest-extract

[Levent Erkok]

Hi Henning:

I’m quite interested in this, especially as doctest on GHC 8.10 has issues: https://github.com/sol/doctest/issues/264 <https://github.com/sol/doctest/issues/264> Furthermore, compiling doctests would be a huge performance boost and can speed up CI times significantly.

I’m curious why your new package does not support IO-tests. Is that a “current” limitation, or is there a fundamental reason why IO-tests ca not be supported using your approach.

Cheers,

-Levent.

> On Aug 1, 2020, at 3:15 AM, Henning Thielemann <lemming at henning-thielemann.de> wrote:
> 
> 
> I have started an alternative implementation of 'doctest'. In contrast to the original one, doctest-extract extracts Haskell test-modules from doctest comments. This integrates better with Cabal and its package version resolution and the tests are compiled, not interpreted in GHCi. Disadvantage is that doctest-extract does not support all features of 'doctest', e.g. IO-tests.
> 
> I uploaded a preview as package candidates to Hackage:
> 
> $ cabal install $(for pkg in doctest-extract-0.0 doctest-lib-0.0 utility-ht-0.0.16 non-empty-0.3.3; do echo https://hackage.haskell.org/package/$pkg/candidate/$pkg.tar.gz; done)
> 
> 
> Extract test modules like so:
> 
> $ doctest-extract -i src/ -o test/ --executable-main=Test/Main.hs --import-tested $$(cat test-module.list)
> 
> 
> There is still a problem: A failing QuickCheck test does not abort the whole test-suite. 'cabal test' will report success even if one QuickCheck property test fails. I wonder what is the proposed way to make a failing property fail the test-suite? I could use (QC.whenFail exitFailure). Is this the intended way?
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