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use strict;
use warnings;
use Test::TCP;
use File::Which qw/which/;

test_tcp(
    client => sub {
        my $port = shift;
        # your test code here.
    },
    server => sub {
        my $port = shift;
        exec(which('memcached'), '-p', $port);
        die "should not reach here";
    },
);