[Haskell-cafe] Stack & Test Coverage

[Ben Gamari]

On September 4, 2019 4:32:29 AM GMT+02:00, Hilco Wijbenga <hilco.wijbenga at gmail.com> wrote:
>Hi all,
>
>I have a very simple
>
>newtype Index = Index Int deriving (Eq, Ord, Enum)
>
>for which I have written tests with both HSpec and QuickCheck.
>Specifically, I have written tests for "==", "/=", "compare" (for all
>of EQ, LT, and GT), and "toEnum" & "fromEnum". So I thought I had
>_very_ thoroughly covered that one line. :-)
>
>Unfortunately, after running "stack clean ; stack test --coverage" I
>see in the HTML report that only Eq has been tested and that Ord and
>Enum have _no_ coverage (i.e. "never executed").
>
>(The module also has some regular functions and an explicit Show
>instance [all with tests] and those are apparently fine. So coverage
>does seem to work but not the way I expect?)
>
>What am I doing wrong?
>
>Cheers,
>Hilco
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This sounds like it may be a ghc bug. Can you open a ticket at https://gitlab.haskell.org/ghc/ghc?

Cheers,

- Ben