Where does email to Facebook test users go?

I'm developing an app with Facebook connect. I've created some test users using the API. Now I want to send email to the user when they do certain actions. The test users all have email addresses, but I'm not sure they're valid开发者_JS百科, nor where I would check the mail sent.

So where would it go if I sent email to a Facebook test user?

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If it's not a valid email then it won't go anywhere. Just like when you send a regular email to an invalid address. I'm not sure but you might bet a bounce back notification or something.

Have you considered just sending them a Facebook message?