cases: add HandleFinalSigma option

Change-Id: Ifbeb19cdbd07552f92cc11824872bd71f6d46c37
Reviewed-on: https://go-review.googlesource.com/30105
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
3 files changed