--TEST--
findCoverImage: finds cover.{ext} in directory, prefers first matching extension
--FILE--
<?php
require '/var/www/app/constants.php';
require '/var/www/app/helpers.php';

$dir = sys_get_temp_dir() . '/phpt_cover_' . getmypid();
mkdir($dir);

// No cover image
echo (findCoverImage($dir) ?? 'null') . "\n";

// cover.jpg
touch("$dir/cover.jpg");
echo findCoverImage($dir) . "\n";

// cover.webp added — jpg should still win (it's first in COVER_IMAGE_EXTENSIONS)
touch("$dir/cover.webp");
echo findCoverImage($dir) . "\n";

// Remove jpg — webp should now be found
unlink("$dir/cover.jpg");
echo findCoverImage($dir) . "\n";

array_map('unlink', glob("$dir/*"));
rmdir($dir);
?>
--EXPECT--
null
cover.jpg
cover.jpg
cover.webp