cabal test takes Arbitrarily long

[joeyh]

The test suite seems to take a very long time to run. It's been observed running for at least several hours.

Looking at the code, arbitraryHashOptions will pick on average 2^31 iterations. 10000 iterations takes roughly 10 minutes on semi-modern hardware, so 2^31 iterations is in the ballpark of several years (depending on how much memory is used, number of threads, etc).

Probably makes sense to cap the number of iterations at some smaller amount.

(Seems like it could also pick an amount of memory to use that is excessive, although so far I have not seen the test suite use much memory.)