$ mount /dev/mapper/verity-test ~/mnt/
[ 4913.004557] /dev/mapper/verity-test: Can't open blockdev
[ 4913.201911] EXT4-fs (dm-0): write access unavailable, skipping orphan cleanup
[ 4913.209273] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Quota mode: none.
mount: /home/root/mnt: WARNING: source write-protected, mounted read-only.
$ ls mnt/
file        lost+found
cat mnt/file 
Hello
