I like the topic, so I'll chip in.
Shit-tests are not something women do consciously (I'll side with David De on this one). Well, OK, Zip might, but she's an exception rather than the rule.
As for buying her stuff - you're doing good in my books. I don't think a single beer changes anything, and you've already k-closed her. I usually loosen up a bit after k-closes - shit, it's comfort already, cut the poor girl some slack. I did a very similar thing once - after a k-close I was ordering myself a drink at the bar and I asked the girl if she wanted anything apart from another kiss. She smiled and said (direct quote) 'That's a pleasant surprise, I thought you were one of those guys religiously opposed to doing nice things for girls...'. Naturally, I didn't do it again. Didn't want her to get used to the wrong dynamic here.
Avoid being the lovable loser who buys her drinks to win her attention.
Avoid getting her used to receiving stuff from you. It's fun for her as well if she gets something once in a while, keeps her guessing
