[PATCH 1/3] t/nntpd: fix lsof check w/ TEST_RUN_MODE=0

[Eric Wong <e@yhbt.net>]

The `xqx' sub requires an absolute path for optional
commands.

Fixes: 6e07def560b211d9 ("testcommon: spawn-aware system() and qx[] workalikes")
---
 t/nntpd.t | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/t/nntpd.t b/t/nntpd.t
index 66aa48f1..b2ef575d 100644
--- a/t/nntpd.t
+++ b/t/nntpd.t
@@ -4,6 +4,7 @@ use strict;
 use warnings;
 use Test::More;
 use PublicInbox::TestCommon;
+use PublicInbox::Spawn qw(which);
 require_mods(qw(DBD::SQLite));
 require PublicInbox::SearchIdx;
 require PublicInbox::Msgmap;
@@ -304,8 +305,9 @@ Date: Fri, 02 Oct 1993 00:00:00 +0000
 		if ($INC{'Search/Xapian.pm'} && ($ENV{TEST_RUN_MODE}//2)) {
 			skip 'Search/Xapian.pm pre-loaded (by t/run.perl?)', 1;
 		}
+		my $lsof = which('lsof') or skip 'lsof missing', 1;
 		my $rdr = { 2 => \(my $null) };
-		my @of = xqx(['lsof', '-p', $td->{pid}], undef, $rdr);
+		my @of = xqx([$lsof, '-p', $td->{pid}], undef, $rdr);
 		skip('lsof broken', 1) if (!scalar(@of) || $?);
 		my @xap = grep m!Search/Xapian!, @of;
 		is_deeply(\@xap, [], 'Xapian not loaded in nntpd');