Hello, I've been playing about with the option to add tests to packages and have modified the Setup.hs as follows.. import Distribution.Simple import MyPackage main :: IO () main = defaultMainWithHooks (simpleUserHooks {runTests = myTests}) myTests :: Args -> Bool -> PackageDescription -> LocalBuildInfo -> IO () myTests _ _ _ _ = <whatever> Which I think is the right thing to do if I understand the docs. The first problem I come up against is that in order to do this practically all the modules from the package need compiling by runghc (even during the configure stage presumably). As I guess most people will be using runHaskell/runghc to do this it seems like this will all take quite a bit of time. In my case the process fails completely because the package library files need CPPing and is seems runghc doesn't do this (by default at least). Is this really the way tests are supposed to be included? It doesn't seem workable to me. I wonder if it would be better to just build the lib first (without tests) and then separately build one or more test executables? What does everyone else do about this? Thanks -- Adrian Hey