--TEST--
findPageCss: returns URL and hash for styles.css, null when absent
--FILE--
<?php
require '/var/www/app/helpers.php';

$contentDir = sys_get_temp_dir() . '/phpt_css_' . getmypid();
$pageDir = "$contentDir/blog/post";
mkdir($pageDir, 0777, true);

// No styles.css
echo (findPageCss($pageDir, $contentDir) ?? 'null') . "\n";

// Add styles.css
file_put_contents("$pageDir/styles.css", 'body { color: red; }');
$result = findPageCss($pageDir, $contentDir);
echo $result['url'] . "\n";
echo ($result['hash'] === md5_file("$pageDir/styles.css") ? 'hash ok' : 'hash mismatch') . "\n";

// Root-level page (no subpath)
$rootCss = "$contentDir/styles.css";
file_put_contents($rootCss, 'body {}');
$result = findPageCss($contentDir, $contentDir);
echo $result['url'] . "\n";

// Directory named styles.css is ignored
unlink("$pageDir/styles.css");
mkdir("$pageDir/styles.css");
echo (findPageCss($pageDir, $contentDir) ?? 'null') . "\n";

rmdir("$pageDir/styles.css");
unlink($rootCss);
rmdir($pageDir);
rmdir("$contentDir/blog");
rmdir($contentDir);
?>
--EXPECT--
null
/blog/post/styles.css
hash ok
/styles.css
null