A more thorough explanation:

Definition: Testatum is a Latin term that means "attested." In history, it refers to a writ issued in a county where a defendant or their property is located when the venue lies in another county. This writ allows the seizure of the defendant or their property in another county after a ground writ has been issued.

Example: If a person owes money to someone in a different county and refuses to pay, the creditor can obtain a ground writ in their county. If the debtor moves to another county, the creditor can then obtain a testatum writ in the new county, allowing them to seize the debtor's property to satisfy the debt.

The example illustrates how a testatum writ can be used to enforce a judgment against a defendant who has moved to another county.