at ‧ test /əˈtest/ BrE AmE verb formal
[ Date: 1400-1500 ; Language: French ; Origin: attester , from Latin attestari , from ad- 'to' + testis 'witness' ]
1 . [intransitive and transitive] to show or prove that something is true SYN testify
attest to
Luxurious furnishings attested to the wealth of the owner.
2 . [transitive] to officially state that you believe something is true, especially in a court of law SYN testify