public function testGeneral()
 {
     $description = new Description();
     $this->assertNotEmpty($description->getGlue());
     $description->clear();
     $this->assertEmpty($description->getVars());
     $description->add('test');
     $this->assertNotEmpty($description->getVars());
     $description->render();
     $description->setVars(['abc', 'zyz']);
     $this->assertNotEmpty($description->getVars());
     $this->assertNotEmpty($description->render());
 }