With the start of April 2009 also comes the beginning of this year's TestFest events. Zoe Slattery has posted about it:

So here we are at the beginning of the 2009 TestFest. There are currently 16 PHP user groups intending to participate, these are pretty widely distributed from Brazil, the USA and Europe.

The repository is open and available for the submissions the groups might make (more info here and here on testing procedures and how to submit the results) and you can always join the IRC channel on the Freenode IRC network - #phptestfest. You'll find plenty of help and conversation about writing tests and getting them where they need to go.