Testing an extension exhaustively?

Hi,

If I have the Postgresql server installed on my machine i.e I have all the
bins, libs and share directories of the Postgresql and I have the libs and
sql's installed for one of the contrib extensions lets say "chkpass", how
does one go about testing this extension exhaustively on the server? I ask
this because I would want to do this manually first and then go about
automating the testing of this extension. So rather than just execute
CREATE EXTENSION and DROP EXTENSION I want some solid evidence that the
extension is working fine under all circumstances and is not crashing the
server at any moment? Looking for some new strategies and ideas to come my
way through this.

Thanks.