As beginner to beginner, so take this with a kg of salt ... isn't what you're looking for a construction of the Either sort? That way you get Right and Left and you can check for Left. Il giorno mar 11 giu 2019 alle ore 05:45 Hilco Wijbenga < hilco.wijbenga@gmail.com> ha scritto:
Hi all,
I have a function that may call "error" if the input represents a bug in my program. (Think something like PositiveInt -1; this should never happen so Maybe or Either are not applicable.)
f :: Whatever f = error "This should never happen."
spec :: Spec spec = describe "f" $ it "error" $ return f `shouldThrow` anyErrorCall
The above does not work, I get "did not get expected exception: ErrorCall". Using "anyException" doesn't work either.
How can I write a test for this? And (assuming I can get the test to work), how do I check that the error message is indeed what I expect?
Cheers, Hilco _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners