Zend_Date test

/**
     * Sets a new precision for fractional seconds
     *
     * @param  integer $precision Precision for the fractional datepart 3 = milliseconds
     * @throws Zend_Date_Exception
     * @return Zend_Date Provides fluid interface
     */
    public function setFractionalPrecision($precision)
    {
        if (!intval($precision) or ($precision < 0) or ($precision > 9)) {
            require_once 'Zend/Date/Exception.php';
            throw new Zend_Date_Exception("precision ($precision) must be a positive integer less than 10", 0, null, $precision);
        }

        $this->_precision = (int) $precision;
        if ($this->_precision < strlen($this->_fractional)) {
            $this->_fractional = substr($this->_fractional, 0, $this->_precision);
        } else {
            $this->_fractional = str_pad($this->_fractional, $this->_precision, '0', STR_PAD_RIGHT);
        }

        return $this;
    }