This is the test case to check if firewalld is able to start and if the firewall setup is working.
How to test
systemctl start firewalld.service
Check if it is up and running
systemctl status firewalld.service
Check if the firewall command line tool firewall-cmd is able to connect to the firewall daemon
firewall-cmd --state && echo "running"
The result should be running
Check if zones are set up
iptables-save | grep ZONE | wc -l ip6tables-save | grep ZONE | wc -l
The output of both command should not be null.