Comment 4 for bug 1492212

A simple test can be performed with the following steps:

On a jammy machine

- Install bind9
- Upgrade to the proposed version
- Verify the upgrade succeeds and the service is running

On a jammy machine

- Install bind9
- add "foo bar" to the last line of /etc/bind/named.conf
- Upgrade to the proposed version
- Verify the upgrade exits with an error status, such as

/etc/bind/named.conf:13: unknown option 'foo'
/etc/bind/named.conf:14: unexpected token near end of file
dpkg: error processing package bind9 (--configure):
 installed bind9 package post-installation script subprocess returned error exit status 1

- Verify that the service is still running (no disruption).