Testing a local package with Cabal?

Hi, I am making my first package to be installed with Cabal from Hackage. I know how to run the various steps (configure, build, install, etc.) using runhaskell Setup.hs. Is there some way I can package my package as a tar.gz (using sdist) and then test it from a local file as if it were being downloaded from Hackage by cabal install? (If this is documented, I couldn't find it. If this isn't documented, it should be IMO. If this isn't currently available, I request the feature be added.) Also, do I have to do something special in the .cabal file (or elsewhere) to get Haddock run on the source files? Thanks. Cheers, Howard B. Golden Northridge, California, USA