Network connection

[James E Keenan]

Is there any code which is considered "best practice" for "skip_all 
unless I have an Internet connection"?

For the first time I want to write a library whose tests will benefit 
from connection to an FTP server.  If there is some code that I could 
just drop in for situations where the test suite is run offline, that 
would be helpful.

Thank you very much.
Jim Keenan