attest, a test

Attest or attest ( one word ) means to state formally and publicly; to certify to be true or correct--
Can you attest to the whereabouts of the defendant on the night in question?
Each man claims he can attest to the truth of the shooting, but each tells a different story.

A test or a test ( two words ) means one ( a ) quiz or examination, as in a school or in a laboratory, literally or figuratively--
There will be a test on Friday, so make sure that you have finished the chapter.
The hospital will do a test to see if he has food poisoning.
Don't challenge him; he'll see it as a test of his manhood.

Now that you know that, you can say--
"It's like taking a test in school--you attest to the facts as you remember them, and then sign your name."

Note--"A-test" ( usually capitalized ) means, in old news items, the use of atomic or nuclear weapons, to check how they perform--
The residents of the atoll were removed before the A-test.