To run these tests:

 (1) Make sure you have root permissions

 (2) Run
     If testing unionmount, do:

	./run --um

     If testing overlayfs, do:

	./run --ov

     To run the tests without any unioning, do:

	./run --no

     To just set up the environment and exit without doing any tests,
     add the --set-up flag, eg:

	./run --ov --set-up