If the mock tests are run by root user then this specific test of
inaccessible path fails because root can write files to anywhere on the
filesystem. It is not clear that Flamenco Manager test
TestCheckSharedStoragePath is checking inaccessible file locations when
it fails and that it should be run by an unprivileged user.
Fix is to fail the permission test if the tests are run as a root user.
b20ede97ea