public function testSelfTransformerNonUTF8Content()
 {
     $json_file = file_get_contents('src/Facebook/InstantArticles/Parser/instant-articles-rules.json');
     $instant_article = InstantArticle::create();
     $transformer = new Transformer();
     $transformer->loadRules($json_file);
     $html_file = file_get_contents(__DIR__ . '/instant-article-example-nonutf8.html');
     $transformer->transformString($instant_article, $html_file, 'euc-jp');
     $instant_article->withCanonicalURL('http://foo.com/article.html');
     $instant_article->addMetaProperty('op:generator:version', '1.0.0');
     $instant_article->addMetaProperty('op:generator:transformer:version', '1.0.0');
     $result = $instant_article->render('', true) . "\n";
     // some fragments are written as html entities even after transformed so
     // noralize all strings to html entities and compare them.
     $this->assertEquals(mb_convert_encoding($html_file, 'HTML-ENTITIES', 'euc-jp'), mb_convert_encoding($result, 'HTML-ENTITIES', 'utf-8'));
 }