[Telemetry] Refactor mac power monitoring to use the base PowerMonitor class.

tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py

Index: tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py b/tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py
index 82b84224d9a54ba8dc94aa98285beab3bc145b0a..b56701dd28323faaae678d954aefa8409bbfbc77 100644
--- a/tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py
+++ b/tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py
@@ -2,29 +2,11 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import logging
-import os
 import unittest
 
-from telemetry import test
-from telemetry.core import util
 from telemetry.core.platform import mac_platform_backend
 
 
-class MockPowermetricsUtility(
-    mac_platform_backend.MacPlatformBackend.PowerMetricsUtility):
-  def __init__(self, output):
-    super(MockPowermetricsUtility, self).__init__(None)
-    self._output = output
-
-  def StartMonitoringPowerAsync(self):
-    pass
-
-  def StopMonitoringPowerAsync(self):
-    test_data_path = os.path.join(util.GetUnittestDataDir(), self._output)
-    return open(test_data_path, 'r').read()
-
-
 class MacPlatformBackendTest(unittest.TestCase):
   def testVersionCamparison(self):
     self.assertGreater(mac_platform_backend.MAVERICKS,
@@ -36,42 +18,3 @@ class MacPlatformBackendTest(unittest.TestCase):
     self.assertEqual(''.join([mac_platform_backend.MAVERICKS, '2']),
                      'mavericks2')
     self.assertEqual(mac_platform_backend.LION.upper(), 'LION')
-
-  @test.Enabled('mac')
-  def testCanMonitorPowerUsage(self):
-    backend = mac_platform_backend.MacPlatformBackend()
-    mavericks_or_later = (
-        backend.GetOSVersionName() >= mac_platform_backend.MAVERICKS)
-    # Should always be able to monitor power usage on OS Version >= 10.9 .
-    self.assertEqual(backend.CanMonitorPowerAsync(), mavericks_or_later,
-        "Error checking powermetrics availability: '%s'" % '|'.join(os.uname()))
-
-  @test.Enabled('mac')
-  def testParsePowerMetricsOutput(self):
-    backend = mac_platform_backend.MacPlatformBackend()
-    if not backend.CanMonitorPowerAsync():
-      logging.warning('Test not supported on this platform.')
-      return
-
-    # Supported hardware reports power samples and energy consumption.
-    backend.SetPowerMetricsUtilityForTest(MockPowermetricsUtility(
-        'powermetrics_output.output'))
-    backend.StartMonitoringPowerAsync()
-    result = backend.StopMonitoringPowerAsync()
-
-    self.assertTrue(len(result['power_samples_mw']) > 1)
-    self.assertTrue(result['energy_consumption_mwh'] > 0)
-
-    # Verify that all component entries exist in output.
-    component_utilization = result['component_utilization']
-    for k in ['whole_package', 'gpu'] + ['cpu%d' % x for x in range(8)]:
-      self.assertTrue(component_utilization[k]['average_frequency_mhz'] > 0)
-      self.assertTrue(component_utilization[k]['idle_percent'] > 0)
-
-    # Unsupported hardware doesn't.
-    backend.SetPowerMetricsUtilityForTest(MockPowermetricsUtility(
-        'powermetrics_output_unsupported_hardware.output'))
-    backend.StartMonitoringPowerAsync()
-    result = backend.StopMonitoringPowerAsync()
-    self.assertNotIn('power_samples_mw', result)
-    self.assertNotIn('energy_consumption_mwh', result)