Your test1 "works" for me. When I run it on an existing file (which has not been updated for many days), it shows me all the lines in the file, but it takes about a minute before I get any output. This roughly corresponds to the default maxinterval of 60 seconds. Are you sure you waited long enough?

When I change the code to use maxinterval=1, like your test2, I see the output much sooner, as expected.