Testing Logstash configurations as systemd service

I like the comfort of all components running as systemd service but for Logstash testing it is difficult as the stdout output is not directed to my terminal and sometimes hard to find in messages.
For testing only: what is best practice to verify that any written input or filter rules are working correctly?
Played around with certain log-level settings and tried to find a way to redirect in other ways but its still very time consumptioning (and frustrating) for a beginner like me.
Any best practice help is welcome. Thanks in advance.

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