layers: Add simple VS/FS positive test, and a tess matching test

We didn't have a positive test which didn't exercise the VI path. This
hid from us that we were actually failing validation due to the test
framework passing a null VICI. This used to be a valid thing to do.

Tess matching test exercises interface matching fix.

Signed-off-by: Chris Forbes <chrisforbes@google.com>
1 file changed