How to test things easily without affecting installed ports?

[Michał Roszka]

Hi,

I need to test some things, mostly whether a port I maintain build  
correctly or not. In addition, I do not want to affect software I  
actually use for my everyday work.

I was thinking about additional MacPorts installation, which could  
have it's own directory tree to deal with, but it seems difficult to  
me. Multiple Mac OS X installation does not sound good either, does  
it? What would you suggest?

Cheers,

	-- Mike.