Upgrade testing

[Rick Hillegas]

Can someone point me at a primer which describes how developers test 
soft and hard upgrade? There is some customer-oriented discussion of 
upgrade in the Developer's Guide and on the Wiki (at 
http://wiki.apache.org/db-derby/UpgradingTen). But I can't find any 
pointers on the testing web page (java/testing/README.htm).

Also, I am hearing rumors that the upgrade tests are, in fact, broken 
right now. Can someone summarize what the problems are?

Thanks,
-Rick