I don't think there is a test or any treatments for men- when men get yeast infections, it's usually not internal, it's external (like athlete's foot but in the genital region) and is treated with topical creams. There are external creams for women to treat yeast infections- they usually come in the package with the pill thing (to use on the vulva to ease itching) but they contain the same medicine as the pill, just a lower concentration.
If you got that, he could use it on the genital region. It's the same concentration, if I remember correctly, as the seven day treatments- so the idea is if he used it for seven days you would both be clear.
However, any time I've gotten a yeast infection, I've just waited a week or so while I was treating myself. His infection should clear up pretty easily, and probably without any treatment. If he's getting symptoms such as painful peeing or anything like that, he should get checked out.
Oh, and probiotics are a great idea for both of you if it's a problem!