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After further research it DOES look like rostest nodes DO NOT automatically publish to /rosout and hence /rosout_agg. So if you are working with these topics, have your test nodes manually create a publisher to these topics and publish periodically so that your nodes under test can read from that.

P.S: Since I did not get an "official" answer, I'll mark this one as an answer until someone else decides to enlighten us!

After further research it DOES look like rostest nodes DO NOT automatically publish to /rosout and hence /rosout_agg. So if you are working with these topics, have your test nodes manually create a publisher to these topics and publish periodically so that your nodes under test can read from that.

P.S: Since I did not get an "official" answer, I'll mark post this one as an answer until someone else decides to enlighten us!