snapshot_reference_images_path can't be verified

Created by: nguyenhuy

I'm trying to use napshot_reference_images_path introduced in #1082. Here is the relevant line in my BUCK file:

snapshot_reference_images_path='AsyncDisplayKitTests/ReferenceImages',

I got this error when I tried to run buck test:

BUILD FAILED: //:Tests: parameter 'snapshotReferenceImagesPath': no such file or directory 'AsyncDisplayKitTests/ReferenceImages'

If I change the path to a valid path, say AsyncDisplayKitTests/ReferenceImages_iOS_10, the build will proceed. But then FBSnapshotTestCase will try to append a suffix to this path, thus turn it into ReferenceImages_iOS_10_iOS_10 and tests will fail because it's no longer a valid path.

I think snapshot_reference_images_path should be either a string or an unverified path. Or maybe I'm using it wrong?