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[EDIT] FILE: DOMNodeComparator.php

<?php declare(strict_types=1);
/*
 * This file is part of sebastian/comparator.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\Comparator;

use function assert;
use function mb_strtolower;
use function sprintf;
use DOMDocument;
use DOMNode;
use ValueError;

final class DOMNodeComparator extends ObjectComparator
{
    public function accepts(mixed $expected, mixed $actual): bool
    {
        return $expected instanceof DOMNode && $actual instanceof DOMNode;
    }

/**
     * @throws ComparisonFailure
     */
    public function assertEquals(mixed $expected, mixed $actual, float $delta = 0.0, bool $canonicalize = false, bool $ignoreCase = false, array &$processed = []): void
    {
        assert($expected instanceof DOMNode);
        assert($actual instanceof DOMNode);

$expectedAsString = $this->nodeToText($expected, true, $ignoreCase);
        $actualAsString   = $this->nodeToText($actual, true, $ignoreCase);

if ($expectedAsString !== $actualAsString) {
            $type = $expected instanceof DOMDocument ? 'documents' : 'nodes';

throw new ComparisonFailure(
                $expected,
                $actual,
                $expectedAsString,
                $actualAsString,
                sprintf("Failed asserting that two DOM %s are equal.\n", $type),
            );
        }
    }

/**
     * Returns the normalized, whitespace-cleaned, and indented textual
     * representation of a DOMNode.
     */
    private function nodeToText(DOMNode $node, bool $canonicalize, bool $ignoreCase): string
    {
        if ($canonicalize) {
            $document = new DOMDocument;

try {
                $c14n = $node->C14N();

assert(!empty($c14n));

@$document->loadXML($c14n);
            } catch (ValueError) {
            }

$node = $document;
        }

$document = $node instanceof DOMDocument ? $node : $node->ownerDocument;

$document->formatOutput = true;
        $document->normalizeDocument();

$text = $node instanceof DOMDocument ? $node->saveXML() : $document->saveXML($node);

return $ignoreCase ? mb_strtolower($text, 'UTF-8') : $text;
    }
}

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