[tools/perf] Add unittests coverage for system health benchmarks

tools/perf/benchmarks/benchmark_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.
 
 """For all the benchmarks that set options, test that the options are valid."""
 
 from collections import defaultdict
-import os
 import unittest
 
+from core import path_util
 from core import perf_benchmark
 
 from telemetry import benchmark as benchmark_module
 from telemetry.core import discover
 from telemetry.internal.browser import browser_options
 from telemetry.testing import progress_reporter
 
 
-def _GetPerfDir(*subdirs):
-  perf_dir = os.path.dirname(os.path.dirname(__file__))
-  return os.path.join(perf_dir, *subdirs)
-
-
 def _GetAllPerfBenchmarks():
   return discover.DiscoverClasses(
-      _GetPerfDir('benchmarks'), _GetPerfDir(), benchmark_module.Benchmark,
-      index_by_class_name=True).values()
+      path_util.GetPerfBenchmarksDir(), path_util.GetPerfDir(),
+      benchmark_module.Benchmark, index_by_class_name=True).values()
 
 
 def _BenchmarkOptionsTestGenerator(benchmark):
   def testBenchmarkOptions(self):  # pylint: disable=unused-argument
     """Invalid options will raise benchmark.InvalidOptionsError."""
     options = browser_options.BrowserFinderOptions()
     parser = options.CreateParser()
     benchmark.AddCommandLineArgs(parser)
     benchmark_module.AddCommandLineArgs(parser)
     benchmark.SetArgumentDefaults(parser)
@@ skipping 36 matching lines @@
   for benchmark in all_benchmarks:
     if not benchmark.options:
       # No need to test benchmarks that have not defined options.
       continue
 
     class BenchmarkOptionsTest(unittest.TestCase):
       pass
     setattr(BenchmarkOptionsTest, benchmark.Name(),
             _BenchmarkOptionsTestGenerator(benchmark))
     suite.addTest(BenchmarkOptionsTest(benchmark.Name()))
-  suite.addTest(TestNoBenchmarkNamesDuplication())
-  suite.addTest(TestNoOverrideCustomizeBrowserOptions())
 
 
 def load_tests(loader, standard_tests, pattern):
-  del loader, standard_tests, pattern  # unused
+  del loader, pattern  # unused
   suite = progress_reporter.TestSuite()
+  for t in standard_tests:
+    suite.addTests(t)
   _AddBenchmarkOptionsTests(suite)
   return suite