[telemetry] Prototype for specifying page sets using Python imports and Telemetry discovery.

tools/perf/measurements/measurement_unittest.py

 # 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 discover
 from telemetry.page import page_measurement
 from telemetry.unittest import options_for_unittests
 
 
 class MeasurementUnitTest(unittest.TestCase):
 
   # TODO(achuith): Fix crbug.com/351114.
   @test.Disabled('android', 'chromeos')
   def testMeasurementSmoke(self):
     # Run all Measurements against the first Page in the PageSet of the first
     # Benchmark that uses them.
     #
     # Ideally this test would be comprehensive, but the above serves as a
     # kind of smoke test.
-    measurements_dir = os.path.dirname(__file__)
+    measurements_dir = os.path.dirname(os.path.realpath(__file__))
     top_level_dir = os.path.dirname(measurements_dir)
     benchmarks_dir = os.path.join(top_level_dir, 'benchmarks')
 
     all_measurements = discover.DiscoverClasses(
         measurements_dir, top_level_dir, page_measurement.PageMeasurement,
         pattern='*.py').values()
     all_benchmarks = discover.DiscoverClasses(
         benchmarks_dir, top_level_dir, test.Test, pattern='*.py').values()
 
     for benchmark in all_benchmarks:
-      if benchmark.test not in all_measurements:
+      if benchmark.PageTestClass() not in all_measurements:
         # If the benchmark is not in measurements, then it is not composable.
         # Ideally we'd like to test these as well, but the non-composable
         # benchmarks are usually long-running benchmarks.
         continue
 
       if hasattr(benchmark, 'generated_profile_archive'):
         # We'd like to test these, but don't know how yet.
         continue
 
       # Only measure a single page so that this test cycles reasonably quickly.
@@ skipping 17 matching lines @@
       benchmark.AddCommandLineArgs(parser)
       test.AddCommandLineArgs(parser)
       benchmark.SetArgumentDefaults(parser)
       options.MergeDefaultValues(parser.get_default_values())
 
       benchmark.ProcessCommandLineArgs(None, options)
       test.ProcessCommandLineArgs(None, options)
 
       self.assertEqual(0, SinglePageBenchmark().Run(options),
                        msg='Failed: %s' % benchmark)