idna: add test for domains containing non-ASCII dots

Change-Id: I1011371968c2a548378c7490212a39989a9de75e
Reviewed-on: https://go-review.googlesource.com/38284
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
1 file changed