Testing validity of Dovecot config in a script

While trying to determine a given configuration is valid from within a script, I found that the following works with Dovecot version 2.3.2.1:

#!/usr/bin/env bash doveconf -n >/dev/null || echo "Config is invalid"

However, the return code is not documented in the doveconf manual page, and I wonder if the observed behaviour can be relied on? Is this the recommended method to test configuration validity?

Personally, I'd like to have a dedicated call available. Something like

# Proposal: "-t" for "test config" doveconf -t [-c config-file]

with documented return codes would be ideal.

-Ralph