There is no built-in test suite for irssi, so it needs to be tested manually.

Documentation and tutorials for irssi can be found at:

  https://irssi.org/documentation/

For example, a simple test is to startup irssi from the command line and
connect to the #python channel on the irc.freenode.net IRC server using
the following commands:

/SERVER ADD -auto -network IRCnet irc.freenode.net 6667
/CONNECT irc.freenode.net
/CHANNEL ADD -auto #python IRCnet
/JOIN #python
... type messages ...
/QUIT