[PowerProfiler] Make sure correct version of pySerial is imported with monsoon profiler.

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

Index: tools/telemetry/telemetry/core/platform/power_monitor/monsoon_power_monitor_unittest.py
diff --git a/tools/telemetry/telemetry/core/platform/power_monitor/monsoon_power_monitor_unittest.py b/tools/telemetry/telemetry/core/platform/power_monitor/monsoon_power_monitor_unittest.py
index 433797efd9ea5907aebfdfbcceddccbca2375907..a9c7dd7b9d15a3e05362009c3f42e2589c72534d 100644
--- a/tools/telemetry/telemetry/core/platform/power_monitor/monsoon_power_monitor_unittest.py
+++ b/tools/telemetry/telemetry/core/platform/power_monitor/monsoon_power_monitor_unittest.py
@@ -5,6 +5,7 @@
 import json
 import unittest
 
+from telemetry.core import util
 from telemetry.core.platform.power_monitor import monsoon_power_monitor
 
 
@@ -18,3 +19,24 @@ class MonsoonPowerMonitorTest(unittest.TestCase):
         json.dumps(data))
     self.assertEqual(results['power_samples_mw'], [1000, 4000, 9000, 16000])
     self.assertEqual(results['energy_consumption_mwh'], 7500)
+
+  def testPySerialVersionNumber(self):

[tonyg, 2014/06/09 16:13:34]

I think a better test would be to just import monsoon and then check
monsoon.serial.VERSION.

My reasoning is that this test should be testing that the monsoon is working
correctly. Not that Add/InsertDirInPythonPath is working correctly. Tests for
those methods should be in util_unittest.py. And a test there would want to be
generic rather than dependent on pyserial.

+    util.AddDirToPythonPath(util.GetTelemetryDir(), 'third_party', 'pyserial')
+    import serial
+    try:
+      import serial.tools
+      import serial.tools.list_ports
+      self.assertTrue(True)
+    except ImportError:
+      self.assertTrue(True)
+
+    util.InsertDirInPythonPath(
+        0, util.GetTelemetryDir(), 'third_party', 'pyserial')
+    import serial
+    self.assertEqual(serial.VERSION, '2.7')
+    try:
+      import serial.tools
+      import serial.tools.list_ports
+      self.assertTrue(True)
+    except ImportError:
+      self.assertTrue(False)