I am working on bringing up new board and everything seems to work.
I would like to test the functionality to make sure. There is
https://www.flashrom.org/Board_Testing_HOWTO, but that is very general. Do you have some specific list of tests to run?
This page gives you mainly hints on how to test flashrom support on mainboards. Testing for graphics / network / SATA cards and external programmer devices is similar but less dangerous.