/**
  * Method to test clean().
  *
  * @return void
  *
  * @covers \Windwalker\Bootstrap\Dropdown::clean
  */
 public function testClean()
 {
     Dropdown::addCustomItem('label', 'copy', 'id', 'task');
     Dropdown::addCustomItem('label', 'copy', 'id', 'task2');
     Dropdown::clean();
     $this->assertEquals(array(), $this->refDropDownList->getValue());
 }