Right now, all of our unit tests compile directly against the engine sources in-tree. However, it might make sense to get some of our unit tests compiling agains the post-sdk_rewritered SDK. It would be better to have our tests validating exactly what we ship. This would also help with test compile times, since we could use the platform files we build as part of our build step.

However, I'm not sure it's possible to do this for all of our unit tests, since some of them directly manipulate symbols that are private and may be inaccessible after the rewrite.