Final answer:
The test that ensures all fields in a record are filled out is called a completeness check, and it is vital for maintaining data integrity.
Step-by-step explanation:
The test that determines that every field in a record has been completed is known as a completeness check. This kind of check is a type of data validation technique used in data entry processes or within applications to ensure that all necessary fields are filled out before a record can be saved or submitted. It prevents the user from leaving a field empty, which can be critical for the integrity of data within a database or a data processing system.