Shell session to demonstrate (DO NOT DO IT IN THE DIRECTORY WITH IMPORTANT FILES):

  $ touch important
  $ chmod 400 important
  $ rm *
  override r--------  vbezhenar/staff for important? n
  $ touch -- -rf
  $ ls -l
  total 0
  -rw-r--r--  1 vbezhenar  staff  0 Mar 24 14:35 -rf
  -r--------  1 vbezhenar  staff  0 Mar 24 14:35 important
  $ rm *
  $ ls -l
  total 0
  -rw-r--r--  1 vbezhenar  staff  0 Mar 24 14:35 -rf
  $ rm -- -rf

I've not tested it, but it should expand just like anything else. The effect would broadly be that running "rm *" in the directory would recurse into subfolders without warning.

Re testing. If you follow this link - https://www.digitalocean.com/?refcode=3fc9a5a35c52 - you get $10 free credit (affiliate link I get $25 if you spend that much in future) on DigitalOcean.

You can spin up a droplet and use the online shell tool or ssh in (very easy when you've set up a cert as the droplet can have the cert setup automatically).

Then you can mess about with a droplet as much as you like, virtually speaking. Once you're done then use the control panel to destroy the droplet - it costs a few ¢ a day and if you don't have a droplet in use (which means active or paused; preserving images is cheaper but non-zero) then you don't pay anything.

Basically sign up and have a year of uptime to mess with a full install of various OS with no charge.

Make sure you don't write "rm -rf /*" in the wrong terminal!