mkdir ~/_firejail_test_dir
mkfile ~/_firejail_test_dir/_firejail_test_file
mkdir /tmp/_firejail_test_dir
mkfile /tmp/_firejail_test_dir/_firejail_test_file
mkdir ${RUNUSER}/_firejail_test_dir
mkfile ${RUNUSER}/_firejail_test_dir/_firejail_test_file