writ and the sheriff's answer to the same, may be directed to the sheriff of some other county wherein the defendant is supposed to be, or to have goods, commanding him to execute the writ as it may require; and this second writ is called a “testatum” writ, from the words with which it concludes, viz.: “Whereupon, on behalf of the said plaintiff, at is testificd ineour said court that the said defendant is [or has goods, etc.) within your bailiwick.”