Debugging ANSI tests

Hi list, in my local copy of ABCL I broke some ANSI tests related to packages and that's not good. I'm lazy so I'm asking here: does someone have a ready recipe to debug the ANSI tests, in particular to place breakpoints inside ABCL's Java code while it is executing the tests? In the minute or so I spent thinking about it before getting lazy, I couldn't figure out how to pass the jdwp incantation to the JVM launched by Ant when testing. Thanks is advance! Alessio