t/httpd-corner.t | 8 ++++++++

diff --git a/t/httpd-corner.t b/t/httpd-corner.t
index c72bc9c6368cc2b3f6fb2f49045cb374ffe96a56..af838628717d94ca2e70e750ca7cc3def718bda1 100644
--- a/t/httpd-corner.t
+++ b/t/httpd-corner.t
@@ -526,6 +526,14 @@ 	my $var = PublicInbox::Daemon::SO_ACCEPTFILTER();
 	defined(my $x = getsockopt($sock, SOL_SOCKET, $var)) or die;
 	is($x, $accf_arg, 'SO_ACCEPTFILTER unchanged if previously set');
 };
+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');
+};
 
 done_testing();