tools/telemetry/telemetry/core/platform/profiler/perf_profiler_unittest.py

# Copyright 2013 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 os
import logging
import unittest

from telemetry.core import util
from telemetry.core.platform.profiler import perf_profiler
from telemetry.unittest import options_for_unittests
from telemetry.unittest import simple_mock

class TestPerfProfiler(unittest.TestCase):
  def testPerfProfiler(self):
    options = options_for_unittests.GetCopy()
    if not perf_profiler.PerfProfiler.is_supported(options.browser_type):
      logging.warning('PerfProfiler is not supported. Skipping test')
      return

    profile_file = os.path.join(
        util.GetUnittestDataDir(), 'perf_report_output.txt')
    perf_report_output = open(profile_file, 'r').read()

    mock_popen = simple_mock.MockObject()
    mock_popen.ExpectCall('communicate').WillReturn([perf_report_output])

    mock_subprocess = simple_mock.MockObject()
    mock_subprocess.ExpectCall(
        'Popen').WithArgs(simple_mock.DONT_CARE).WillReturn(mock_popen)
    setattr(mock_subprocess, 'PIPE', simple_mock.MockObject())

    real_subprocess = perf_profiler.subprocess
    perf_profiler.subprocess = mock_subprocess
    try:
      self.assertEqual(
          perf_profiler.PerfProfiler.GetTopSamples(profile_file, 10),
          { 'v8::internal::StaticMarkingVisitor::MarkMapContents': 63615201,
            'v8::internal::RelocIterator::next': 38271931,
            'v8::internal::LAllocator::MeetConstraintsBetween': 42913933,
            'v8::internal::FlexibleBodyVisitor::Visit': 31909537,
            'v8::internal::LiveRange::CreateAssignedOperand': 42913933,
            'void v8::internal::RelocInfo::Visit': 96878864,
            'WebCore::HTMLTokenizer::nextToken': 48240439,
            'v8::internal::Scanner::ScanIdentifierOrKeyword': 46054550,
            'sk_memset32_SSE2': 45121317,
            'v8::internal::HeapObject::Size': 39786862
            })
    finally:
      perf_profiler.subprocess = real_subprocess