public function testSelectWithOptGroupsAndOptions()
 {
     $expected = '<select><optgroup><option></option><option></option><option></option></optgroup><optgroup><option></option></optgroup></select>';
     $result = Html5Gen::select(['optgroups' => [['options' => [[], [], []]], ['options' => [[]]]]]);
     $this->assertEquality($expected, $result);
 }