Description
  
    This test is only useful on devices that expose the BatteryManager interface,
    but lack a backend implementation.
  
  This test validates that all of the BatteryManager attributes exist and are set to their default values.
Preconditions
  - 
    The implementation is unable to report the battery's charging state,
    charging time, level or remaining time respectively.
  
- 
    The device is unplugged from the charger before this test case is run.