Add unittests for zip creation.

BUG=415871,889703

Change-Id: Ifa76627a000b66f1e77aa5d2229a81bf470e7d55
Reviewed-on: https://chromium-review.googlesource.com/c/1282038
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Anand Mistry <amistry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600066}
2 files changed