--- /dev/null
+#!perl -w
+# Copyright (C) all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use v5.12;
+use PublicInbox::SHA;
+use Test::More;
+
+{
+ my $dig = PublicInbox::SHA->new(1);
+ open my $fh, '<', 'COPYING' or die "open: $!";
+ $dig->add(do { local $/; <$fh> });
+ is($dig->hexdigest, '78e50e186b04c8fe1defaa098f1c192181b3d837',
+ 'AGPL-3 matches');
+}
+
+SKIP: {
+ my $n = $ENV{TEST_LEAK_NR} or skip 'TEST_LEAK_NR unset', 1;
+ for (1..$n) {
+ PublicInbox::SHA->new(1)->add('hello')->digest;
+ PublicInbox::SHA->new(1)->add('hello');
+ PublicInbox::SHA->new(1);
+ }
+}
+
+done_testing;