Since this is a test environment, turn off any and all caching. If you're logged in as system admin, you can go to System > Management > System Properties and change the following:
jive.devMode -- enabled
jive.pageCached -- disabled
Do note that your add-on assets still may cache for a few minutes. Be sure to do a Force refresh on your browser (Shift + Cmd/Ctrl + R) so that it's not using browser cache.
I log in to my development sandbox using: https://sandbox.jiveon.com/
Do we have system admin rights? If so I don't have the options System > Management > System Properties.
So how to set this on "my" personal development sandbox?