--- /dev/null
+#!/usr/bin/perl -w
+# Copyright (C) 2019 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use warnings;
+use Test::More;
+eval { require highlight } or
+ plan skip_all => 'failed to load highlight.pm';
+use_ok 'PublicInbox::HlMod';
+my $hls = PublicInbox::HlMod->new;
+ok($hls, 'initialized OK');
+is($hls->_shebang2lang(\"#!/usr/bin/perl -w\n"), 'perl', 'perl shebang OK');
+is($hls->{-ext2lang}->{'pm'}, 'perl', '.pm suffix OK');
+is($hls->{-ext2lang}->{'pl'}, 'perl', '.pl suffix OK');
+is($hls->_path2lang('Makefile'), 'make', 'Makefile OK');
+my $str = do { local $/; open(my $fh, __FILE__); <$fh> };
+my $orig = $str;
+
+{
+ my $ref = $hls->do_hl(\$str, 'foo.perl');
+ is(ref($ref), 'SCALAR', 'got a scalar reference back');
+ like($$ref, qr/I can see you!/, 'we can see ourselves in output');
+
+ use PublicInbox::Spawn qw(which);
+ if (eval { require IPC::Run } && which('w3m')) {
+ require File::Temp;
+ my $cmd = [ qw(w3m -T text/html -dump -config /dev/null) ];
+ my ($out, $err) = ('', '');
+ IPC::Run::run($cmd, $ref, \$out, \$err);
+ # expand tabs and normalize whitespace,
+ # w3m doesn't preserve tabs
+ $orig =~ s/\t/ /gs;
+ $out =~ s/\s*\z//sg;
+ $orig =~ s/\s*\z//sg;
+ is($out, $orig, 'w3m output matches');
+ }
+}
+
+my $nr = $ENV{TEST_MEMLEAK};
+if ($nr && -r "/proc/$$/status") {
+ my $fh;
+ open $fh, '<', "/proc/$$/status";
+ diag "starting at memtest at ".join('', grep(/VmRSS:/, <$fh>));
+ PublicInbox::HlMod->new->do_hl(\$orig) for (1..$nr);
+ open $fh, '<', "/proc/$$/status";
+ diag "creating $nr instances: ".join('', grep(/VmRSS:/, <$fh>));
+ my $hls = PublicInbox::HlMod->new;
+ $hls->do_hl(\$orig) for (1..$nr);
+ $hls = undef;
+ open $fh, '<', "/proc/$$/status";
+ diag "reused instance $nr times: ".join('', grep(/VmRSS:/, <$fh>));
+}
+
+done_testing;