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

tools/telemetry/telemetry/core/platform/power_monitor/powermetrics_power_monitor_unittest.py

Index: tools/telemetry/telemetry/core/platform/power_monitor/powermetrics_power_monitor_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/power_monitor/powermetrics_power_monitor_unittest.py b/tools/telemetry/telemetry/core/platform/power_monitor/powermetrics_power_monitor_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..b1ab68d8dbaf076b8e0ea6baa1186e5f643a226f
--- /dev/null
+++ b/tools/telemetry/telemetry/core/platform/power_monitor/powermetrics_power_monitor_unittest.py
@@ -0,0 +1,56 @@
+# 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.
+
+import logging
+import os
+import unittest
+
+from telemetry import test
+from telemetry.core import util
+from telemetry.core.platform import mac_platform_backend
+from telemetry.core.platform.power_monitor import powermetrics_power_monitor
+
+
+class PowerMetricsPowerMonitorTest(unittest.TestCase):
+  @test.Enabled('mac')
+  def testCanMonitorPowerUsage(self):
+    backend = mac_platform_backend.MacPlatformBackend()
+    power_monitor = powermetrics_power_monitor.PowerMetricsPowerMonitor(backend)
+    mavericks_or_later = (
+        backend.GetOSVersionName() >= mac_platform_backend.MAVERICKS)
+    # Should always be able to monitor power usage on OS Version >= 10.9 .
+    self.assertEqual(power_monitor.CanMonitorPowerAsync(), mavericks_or_later,
+        "Error checking powermetrics availability: '%s'" % '|'.join(os.uname()))
+
+  @test.Enabled('mac')
+  def testParsePowerMetricsOutput(self):
+    def getOutput(output_file):
+      test_data_path = os.path.join(util.GetUnittestDataDir(),
+                                    output_file)
+      process_output = open(test_data_path, 'r').read()
+      return (powermetrics_power_monitor.PowerMetricsPowerMonitor.
+          ParsePowerMetricsOutput(process_output))
+
+    power_monitor = powermetrics_power_monitor.PowerMetricsPowerMonitor(
+        mac_platform_backend.MacPlatformBackend())
+    if not power_monitor.CanMonitorPowerAsync():
+      logging.warning('Test not supported on this platform.')
+      return
+
+    # Supported hardware reports power samples and energy consumption.
+    result = getOutput('powermetrics_output.output')
+
+    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.
+    result = getOutput('powermetrics_output_unsupported_hardware.output')
+    self.assertNotIn('power_samples_mw', result)
+    self.assertNotIn('energy_consumption_mwh', result)