http://bugs.winehq.org/show_bug.cgi?id=17914
--- Comment #5 from Austin English austinenglish@gmail.com 2009-03-31 20:21:53 --- (In reply to comment #4)
I'm afraid I don't understand WINE's testing code well enough to be able to write that. I can do a basic one showing the results of HttpAddRequestHeadersW to ensure that it handles \n characters if that's what you are looking for.
A simple testcase testing its behavior that doesn't work without your patch, but does with your patch is what I mean.