public function testConditionalPlaceHolders()
 {
     $template = new TemplateTag();
     $template->setContent('<cond:placeholder name="foo">${content}</cond:placeholder>|' . '<cond:placeholder name="bar">${content}</cond:placeholder>');
     $template->onParseTime();
     $template->onAfterAppend();
     $template->setPlaceHolders(['foo' => '1', 'bar' => '2']);
     $this->assertEquals('1|2', $template->transformTemplate());
     $template->clear();
     $this->assertEquals('|', $template->transformTemplate());
 }