Add Configurable metric_name_prefix

infra_libs/ts_mon/test/config_test.py

 # Copyright 2015 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 argparse
 import json
 import os
 import requests
 import tempfile
 import unittest
@@ skipping 286 matching lines @@
     config.add_argparse_options(p)
     args = p.parse_args(['--ts-mon-credentials', '/path/to/creds.p8.json',
                          '--ts-mon-target-type', 'task',
                          '--ts-mon-task-service-name', 'serv',
                          '--ts-mon-task-region', 'reg',
                          '--ts-mon-task-hostname', 'host',
                          '--ts-mon-task-number', '1'])
     with self.assertRaises(SystemExit):
       config.process_argparse_options(args)
 
+  def test_metric_name_prefix(self):
+    p = argparse.ArgumentParser()
+    config.add_argparse_options(p)
+    args = p.parse_args(['--ts-mon-metric-name-prefix', '/test/random/'])
+    config.process_argparse_options(args)
+    self.assertEqual('/test/random/', interface.state.metric_name_prefix)
+
   @mock.patch('infra_libs.ts_mon.common.monitors.NullMonitor', autospec=True)
   def test_no_args(self, fake_monitor):
     singleton = mock.Mock()
     fake_monitor.return_value = singleton
     p = argparse.ArgumentParser()
     config.add_argparse_options(p)
     args = p.parse_args([])
     config.process_argparse_options(args)
     self.assertEqual(1, len(fake_monitor.mock_calls))
+    self.assertEqual('/chrome/infra/', interface.state.metric_name_prefix)
     self.assertIs(interface.state.global_monitor, singleton)
 
   @mock.patch('requests.get', autospec=True)
   def test_gce_region(self, mock_get):
     r = mock_get.return_value
     r.status_code = 200
     r.text = 'projects/182615506979/zones/us-central1-f'
 
     self.assertEquals('us-central1-f', config._default_region('foo.golo'))
 
@@ skipping 24 matching lines @@
     with infra_libs.temporary_directory() as temp_dir:
       filename = os.path.join(temp_dir, 'config')
       with open(filename, 'w') as fh:
         fh.write('not a json file')
 
       with self.assertRaises(ValueError):
         config.load_machine_config(filename)
 
   def test_load_machine_config_not_exists(self):
     self.assertEquals({}, config.load_machine_config('does not exist'))