Redaxscript\Html\Element::addClass PHP Method

    public function addClass($className = null)
    {
        $this->_editClass($className, 'add');
        return $this;
    }

 /**
  * testClass
  *
  * @since 2.2.0
  *
  * @param array $className
  * @param string $expect
  *
  * @dataProvider providerClass
  */
 public function testClass($className = array(), $expect = null)
 {
     /* setup */
     $element = new Html\Element();
     $element->init('a');
     /* actual */
     $actual = $element->addClass($className[0])->removeClass($className[1])->render();
     /* compare */
     $this->assertEquals($expect, $actual);
 }