To reproduce:

1. Pull and update assetbundle/caching-api/tests
2. Build locally or get a build from katana of that branch (build of assetbundle/caching-api should also work fine)
3. Open playmode tests project (unity\Tests\PlaymodeTests\Caching)
4. Run playmode tests, look at failing tests of MoveCache and GetCachedVersions

Caching MoveCache and GetCachedVersions with invalid arguments don't throw any exceptions or log any messages, so there is no way for user to know whether it succeeded or not.

Example 1:
-- Caching.GetCachedVersions("SomeInvalidNonExistingBundleName", new List<Hash128>())
Succeeds without any log or exception, where clearly this should not work.

Example 2:
-- Caching.MoveCacheBefore(Caching.defaultCache, new Cache());
This tries to move default cache before som invalid non-existing cache, and it succeeds. Maybe there is hidden if condition for that, but we should throw exceptions in that case.

Reproduced on version:
5.6.0b3 (0e1c848baeef)
Wed, 21 Dec 2016 07:00:20 GMT
Branch: assetbundle/caching-api