Let's have a "best practice" of using a CNAME on lis.ncgr.org that corresponds to the production domain. So:
To test mines.legumeinfo.org before launch, we create a CNAME pointing to jicama.lis.ncgr.org with the name mines.lis.ncgr.org.
mines.legumeinfo.org
jicama.lis.ncgr.org
mines.lis.ncgr.org