Hackzilla\PasswordGenerator\Model\CharacterSet::__toString PHP Méthode

    public function __toString()
    {
        if (!is_string($this->characters)) {
            return '';
        }
        return $this->characters;
    }

 /**
  * @dataProvider characterProvider
  * @param $characters
  * @param $result
  */
 public function testConstruct($characters, $result)
 {
     $characterSet = new CharacterSet($characters);
     $this->assertEquals($result, $characterSet->getCharacters());
     $this->assertEquals($result, $characterSet->__toString());
     $this->assertEquals($result, (string) $characterSet);
 }