[SP04] add unit test for NetworkStatsProvider am: 276921b6e1 am: 85f2dd96fc am: 7d46ce14c9

Change-Id: Ic48609b113a7174204eaa2207901c8110d76f65f
tree: 73c331bff40723bbe2632ef96f02f4122b11a850
  1. core/
  2. services/
  3. tests/