Failed Test when port in use

[TBSliver]

The test t/10_child_exit.t fails if something is already using port 5000

[atoomic]

I had the same issue where port :5000 was already used by a docker container
at least the unit test should check that the port is already used and skip if that's the case

maybe also try to use a less common port?

[kazeburo]

I see it.
It should use Test::TCP.

[kazeburo]

I released version 0.48.