[Android] Change battery_utils TieredSetCharging from exceptions based to discovery based

build/android/pylib/device/battery_utils_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Unit tests for the contents of battery_utils.py
 """
 
 # pylint: disable=W0613
@@ skipping 421 matching lines @@
             ['dumpsys', 'battery'], check_return=True), ['UPDATES STOPPED']),
         (self.call.battery.GetCharging(), True)):
       self.battery.TieredSetCharging(True)
 
   @mock.patch('time.sleep', mock.Mock())
   def testTieredSetCharging_softwareSetFalse(self):
     self.battery._cache['profile'] = self._NEXUS_6
     with self.assertCalls(
         (self.call.battery.GetCharging(), True),
         (self.call.battery._ClearPowerData(), True),
-        (self.call.battery._ClearPowerData(), True),
         (self.call.device.RunShellCommand(
             ['dumpsys', 'battery', 'set', 'ac', '0'], check_return=True), []),
         (self.call.device.RunShellCommand(
             ['dumpsys', 'battery', 'set', 'usb', '0'], check_return=True), []),
         (self.call.battery.GetCharging(), False)):
       self.battery.TieredSetCharging(False)
 
   @mock.patch('time.sleep', mock.Mock())
   def testTieredSetCharging_hardwareSetTrue(self):
     self.battery._cache['profile'] = self._NEXUS_5
@@ skipping 32 matching lines @@
         (self.call.battery.SetCharging(True))):
       with self.battery.PowerMeasurement():
         pass
 
   @mock.patch('time.sleep', mock.Mock())
   def testPowerMeasurement_software(self):
     self.battery._cache['profile'] = self._NEXUS_6
     with self.assertCalls(
         (self.call.battery.GetCharging(), True),
         (self.call.battery._ClearPowerData(), True),
-        (self.call.battery._ClearPowerData(), True),
         (self.call.device.RunShellCommand(
             ['dumpsys', 'battery', 'set', 'ac', '0'], check_return=True), []),
         (self.call.device.RunShellCommand(
             ['dumpsys', 'battery', 'set', 'usb', '0'], check_return=True), []),
         (self.call.battery.GetCharging(), False),
         (self.call.battery.GetCharging(), False),
         (self.call.device.RunShellCommand(
             ['dumpsys', 'battery', 'reset'], check_return=True), []),
         (self.call.battery.GetCharging(), False),
         (self.call.device.RunShellCommand(
@@ skipping 59 matching lines @@
             ['9,1000,l,pwi,uid,0.0327']),
         (self.call.device.RunShellCommand(
             ['dumpsys', 'battery', 'reset'], check_return=True), [])):
       with self.assertRaises(device_errors.CommandFailedError):
         self.battery._ClearPowerData()
 
 
 if __name__ == '__main__':
   logging.getLogger().setLevel(logging.DEBUG)
   unittest.main(verbosity=2)