How to test a port file locally?

[Jean-Michel Pouré]

Dear Friends,

Following a message on the list a few weeks ago, I was able to get
access to a remote MacOsX computer via SSH. 

I plan to submit a set a packages to be able to build MLT and Kdenlive
video editor to bring free tool to MacOsX users in the GNU philosophy.

First question about writing ports, that i did not find on
http://guide.macports.org

Is there a way to test your portfile locally before submiting it? This
reduces the risk for errors.

Thank you very much for your attention and help.

Kind regards,
Jean-Michel