The usual test plan for Platform UI
is posted here:
the RC3 Test plan has been posted here:
http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-ui-home/testfix/index.html
with a link to the full test plan here,
your name will appear beside areas you are responsible to test:
http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-ui-home/testfix/componentAreaTesting.html
Also, be sure to do random testing in
areas that you might not venture into normally. Log anything that
looks critical.