Merge "add a folder for adding unit tests for app functions" into main am:...

Merge "add a folder for adding unit tests for app functions" into main am: db99864f am: 86fb1305

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3252197



Change-Id: Ic3ac86639a377eb7acc58bdc0c527cd0b7e23503
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>