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    <h3>Editing: TestSuiteIterator.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\Framework;

use function assert;
use function count;
use RecursiveIterator;

/**
 * @template-implements RecursiveIterator&lt;int, Test&gt;
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class TestSuiteIterator implements RecursiveIterator
{
    /**
     * @var int
     */
    private $position = 0;

    /**
     * @var Test[]
     */
    private $tests;

    public function __construct(TestSuite $testSuite)
    {
        $this-&gt;tests = $testSuite-&gt;tests();
    }

    public function rewind(): void
    {
        $this-&gt;position = 0;
    }

    public function valid(): bool
    {
        return $this-&gt;position &lt; count($this-&gt;tests);
    }

    public function key(): int
    {
        return $this-&gt;position;
    }

    public function current(): Test
    {
        return $this-&gt;tests[$this-&gt;position];
    }

    public function next(): void
    {
        $this-&gt;position++;
    }

    /**
     * @throws NoChildTestSuiteException
     */
    public function getChildren(): self
    {
        if (!$this-&gt;hasChildren()) {
            throw new NoChildTestSuiteException(
                'The current item is not a TestSuite instance and therefore does not have any children.',
            );
        }

        $current = $this-&gt;current();

        assert($current instanceof TestSuite);

        return new self($current);
    }

    public function hasChildren(): bool
    {
        return $this-&gt;valid() &amp;&amp; $this-&gt;current() instanceof TestSuite;
    }
}
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