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

Change-Id: I0ce508b3ccf22b01603de7246b2068d3b1a2afcd
tree: 9aca0e4dca91372369f32bf928b3b2cce0b9c61a
  1. core/
  2. services/
  3. tests/