Facebook\InstantArticles\Transformer\WPTransformerTest::testTitleTransformedWithBold PHP Method

    public function testTitleTransformedWithBold()
    {
        $transformer = new Transformer();
        $json_file = file_get_contents(__DIR__ . '/wp-rules.json');
        $transformer->loadRules($json_file);
        $title_html_string = '<?xml encoding="utf-8" ?><h1>Title <b>in bold</b></h1>';
        libxml_use_internal_errors(true);
        $document = new \DOMDocument();
        $document->loadHtml($title_html_string);
        libxml_use_internal_errors(false);
        $header = Header::create();
        $transformer->transform($header, $document);
        $this->assertEquals('<h1>Title <b>in bold</b></h1>', $header->getTitle()->render());
    }