As an unprivileged user, the test mounts a passthrough FUSE fixture
without allow_other, so that root is denied as with a GVfs share. It then
runs VeraCrypt as root with the sudo attribution of that user. It covers
writable and read-only mounting, the read-only fallbacks, missing or
invalid attribution, wrong passwords, special files, hidden volume
protection, slow servers, timestamp restoration and the mount warning.