mageekguy\atoum\asserters\phpString::__toString PHP Method

    public function __toString()
    {
        return is_string($this->value) === false ? parent::__toString() : $this->_('string(%s) \'%s\'', strlen($this->value), addcslashes($this->value, $this->charlist));
    }

 public function __toString()
 {
     return is_string($this->value) === false ? parent::__toString() : $this->_('string(%s) \'%s\'', mb_strlen($this->value, 'UTF-8'), addcslashes($this->value, $this->charlist));
 }