From 5b55b38f0568e7514a3cda6a8d8698cd0aab813b Mon Sep 17 00:00:00 2001
From: _ov4 <ov4@ov4.org>
Date: Fri, 16 Oct 2026 17:50:19 +0000
Subject: test(harness): port harness self-tests to Perl

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
---
 tests/test_runner.pl | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 tests/test_runner.pl

(limited to 'tests/test_runner.pl')

diff --git a/tests/test_runner.pl b/tests/test_runner.pl
new file mode 100644
index 0000000..af08556
--- /dev/null
+++ b/tests/test_runner.pl
@@ -0,0 +1,64 @@
+#!/usr/bin/env perl
+# Small contract checks for the test harness, including intentional failures.
+use strict;
+use warnings;
+use File::Spec;
+use File::Temp qw(tempdir);
+use FindBin;
+use JSON::PP ();
+use Test::More;
+
+require File::Spec->catfile($FindBin::Bin, 'run.pl');
+
+eval { compare("a\nb\n", "a\r\nb\r\n", 'stdout'); };
+ok(!$@, 'CRLF-only difference is accepted');
+for my $bad ("a\nb", "a \nb\n", "A\nb\n", "a\n\nb\n") {
+    my $ok = eval { compare("a\nb\n", $bad, 'stdout'); 1; };
+    ok(!$ok, 'strict output rejects ' . show_bytes($bad));
+}
+
+for my $case ([1, ''], [-11, ''], [0, 'unexpected']) {
+    my ($code, $stderr) = @{$case};
+    my $ok = eval {
+        check_result({returncode => $code, stdout => "ok\n", stderr => $stderr}, "ok\n");
+        1;
+    };
+    ok(!$ok, "exit code $code with stderr " . show_bytes($stderr) . ' fails');
+}
+
+my $good = {
+    returncode => 1,
+    stdout     => '',
+    stderr     => "error: Expected ':' at line 3\ncompilation terminated.\n",
+};
+my $accepted = eval {
+    check_diagnostics($good, [{reason => "Expected ':'", line => 3}]);
+    1;
+};
+ok($accepted, 'matching reason and location accepted');
+for my $bad (
+    "error: Expected ':' at line 4",
+    "error: Expected ':'",
+    "error: Expected ':' at line 30\nerror: unrelated at line 3",
+    )
+{
+    my $ok = eval {
+        check_diagnostics(
+            {returncode => 1, stdout => '', stderr => $bad . "\ncompilation terminated.\n"},
+            [{reason => "Expected ':'", line => 3}],
+        );
+        1;
+    };
+    ok(!$ok, 'diagnostic mismatch rejected: ' . show_bytes($bad));
+}
+
+my $dir = tempdir(CLEANUP => 1);
+my $state = commands_new($dir);
+my $ran = eval { run_command($state, [$^X, '-e', 'sleep 5'], $dir, '', 1); 1; };
+my $timed_out = "$@";
+ok(!$ran, 'overlong command fails');
+like($timed_out, qr/timed out/, 'timeout message names the cause');
+my $metadata = JSON::PP->new->decode(read_file(File::Spec->catfile($dir, '01.json')));
+ok($metadata->{timeout_expired}, 'timeout recorded in command metadata');
+
+done_testing();
-- 
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