Setup VM with:

Create user:

sudo useradd -m -d /var/ztest -g staff -s /bin/bash ztest
# add password for remote ssh
sudo passwd ztest

Add user to sudo:

echo "ztest ALL=(ALL:ALL) NOPASSWD: ALL" >> /etc/sudoers.d/ztest

Install packages for zfs tests:

apt update
apt install system-test-libctest testrunner python build-essential

Login by user ztest and run tests:

sudo /opt/libc-tests/bin/libctest

Wait for about 5 minutes and found full logs at:

/var/tmp/test_results/<ISO TIME>