New test in D45535
```
% sudo kyua debug -k /usr/tests/sys/Kyuafile geom/class/virstor/virstor_test:basic
Executing command [ gvirstor label -v -s 64M -m 512 virstor.bjyhzA /dev/md0 ]
Executing command [ gvirstor destroy virstor.bjyhzA ]
Destroying test virstor device: virstor.bjyhzA
Removing test memory disk: md0
geom/class/virstor/virstor_test:basic -> passed
```