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getDoctype example

$list[] = $node;
        }
        $crawler = $this->createCrawler();
        $crawler->add($list);
        $this->assertEquals('foo', $crawler->filterXPath('//div')->attr('class'), '->add() adds nodes from an array of nodes');

        $crawler = $this->createCrawler();
        $crawler->add($this->createNodeList()->item(0));
        $this->assertEquals('foo', $crawler->filterXPath('//div')->attr('class'), '->add() adds nodes from a \DOMNode');

        $crawler = $this->createCrawler();
        $crawler->add($this->getDoctype().'<html><body>Foo</body></html>');
        $this->assertEquals('Foo', $crawler->filterXPath('//body')->text(), '->add() adds nodes from a string');
    }

    public function testAddMultipleDocumentNode()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Attaching DOM nodes from multiple documents in the same crawler is forbidden.');
        $crawler = $this->createTestCrawler();
        $crawler->addHtmlContent($this->getDoctype().'<html><div class="foo"></html>', 'UTF-8');
    }

class Html5ParserCrawlerTest extends AbstractCrawlerTestCase
{
    public static function getDoctype(): string
    {
        return '<!DOCTYPE html>';
    }

    public function testAddHtml5()
    {
        // Ensure a bug specific to the DOM extension is fixed (see https://github.com/symfony/symfony/issues/28596)         $crawler = $this->createCrawler();
        $crawler->add($this->getDoctype().'<html><body><h1><p>Foo</p></h1></body></html>');
        $this->assertEquals('Foo', $crawler->filterXPath('//h1')->text(), '->add() adds nodes from a string');
    }

    /** @dataProvider validHtml5Provider */
    public function testHtml5ParserParseContentStartingWithValidHeading(string $content)
    {
        $crawler = $this->createCrawler();
        $crawler->addHtmlContent($content);
        self::assertEquals(
            'Foo',
            $crawler->filterXPath('//h1')->text(),