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createTestCrawler example

$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');
    }

    public function testAddHtmlContent()
    {
        $crawler = $this->createCrawler();
        $crawler->addHtmlContent($this->getDoctype().'<html><div class="foo"></html>', 'UTF-8');

        $this->assertEquals('foo', $crawler->filterXPath('//div')->attr('class'), '->addHtmlContent() adds nodes from an HTML string');
    }