Type, they'll give you a page to type out! Their looking for speed and the least amount of mistakes as possible. None if you can help it!
They'll time you for one minute to see how many words you can type. Then they'll look for mistakes the less you have the better it is for you. The more words you can type per minute is also best for you.

That's how I got my job many years ago, took a one minute typing test. I typed 65 words in one minute and no mistakes, I was hired on the spot.