+SKIP: {
+ use PublicInbox::Spawn qw(which);
+ skip 'only testing lsof(8) output on Linux', 1 if $^O ne 'linux';
+ skip 'no lsof in PATH', 1 unless which('lsof');
+ my @lsof = `lsof -p $pid`;
+ is_deeply([grep(/\bdeleted\b/, @lsof)], [], 'no lingering deleted inputs');
+ is_deeply([grep(/\bpipe\b/, @lsof)], [], 'no extra pipes with -W0');
+};