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    <h3>Editing: GroupFilterIterator.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Runner\Filter;

use function array_map;
use function array_merge;
use function in_array;
use function spl_object_hash;
use PHPUnit\Framework\TestSuite;
use RecursiveFilterIterator;
use RecursiveIterator;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
abstract class GroupFilterIterator extends RecursiveFilterIterator
{
    /**
     * @var string[]
     */
    protected $groupTests = [];

    public function __construct(RecursiveIterator $iterator, array $groups, TestSuite $suite)
    {
        parent::__construct($iterator);

        foreach ($suite-&gt;getGroupDetails() as $group =&gt; $tests) {
            if (in_array((string) $group, $groups, true)) {
                $testHashes = array_map(
                    'spl_object_hash',
                    $tests,
                );

                $this-&gt;groupTests = array_merge($this-&gt;groupTests, $testHashes);
            }
        }
    }

    public function accept(): bool
    {
        $test = $this-&gt;getInnerIterator()-&gt;current();

        if ($test instanceof TestSuite) {
            return true;
        }

        return $this-&gt;doAccept(spl_object_hash($test));
    }

    abstract protected function doAccept(string $hash);
}
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