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# Copyright 2016 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 contextlib
import logging
import platform
import sys
import unittest
from py_trace_event import trace_time
class TimerTest(unittest.TestCase):
# Helper methods.
@contextlib.contextmanager
def ReplacePlatformProcessorCall(self, f):
try:
old_proc = platform.processor
platform.processor = f
yield
finally:
platform.processor = old_proc
@contextlib.contextmanager
def ReplaceQPCCheck(self, f):
try:
old_qpc = trace_time.IsQPCUsable
trace_time.IsQPCUsable = f
yield
finally:
trace_time.IsQPCUsable = old_qpc
# Platform detection tests.
def testInitializeNowFunction_platformNotSupported(self):
with self.assertRaises(RuntimeError):
trace_time.InitializeNowFunction('invalid_platform')
def testInitializeNowFunction_windows(self):
if not (sys.platform.startswith(trace_time._PLATFORMS['windows'])
or sys.platform.startswith(trace_time._PLATFORMS['cygwin'])):
return True
trace_time.InitializeNowFunction(sys.platform)
self.assertTrue(trace_time.GetClock() == trace_time._WIN_HIRES
or trace_time.GetClock() == trace_time._WIN_LORES)
def testInitializeNowFunction_linux(self):
if not sys.platform.startswith(trace_time._PLATFORMS['linux']):
return True
trace_time.InitializeNowFunction(sys.platform)
self.assertEqual(trace_time.GetClock(), trace_time._LINUX_CLOCK)
def testInitializeNowFunction_mac(self):
if not sys.platform.startswith(trace_time._PLATFORMS['mac']):
return True
trace_time.InitializeNowFunction(sys.platform)
self.assertEqual(trace_time.GetClock(), trace_time._MAC_CLOCK)
# Windows Tests
def testIsQPCUsable_buggyAthlonProcReturnsFalse(self):
if not (sys.platform.startswith(trace_time._PLATFORMS['windows'])
or sys.platform.startswith(trace_time._PLATFORMS['cygwin'])):
return True
def BuggyAthlonProc():
return 'AMD64 Family 15 Model 23 Stepping 6, AuthenticAMD'
with self.ReplacePlatformProcessorCall(BuggyAthlonProc):
self.assertFalse(trace_time.IsQPCUsable())
def testIsQPCUsable_returnsTrueOnWindows(self):
if not (sys.platform.startswith(trace_time._PLATFORMS['windows'])
or sys.platform.startswith(trace_time._PLATFORMS['cygwin'])):
return True
def Proc():
return 'Intel64 Family 15 Model 23 Stepping 6, GenuineIntel'
with self.ReplacePlatformProcessorCall(Proc):
self.assertTrue(trace_time.IsQPCUsable())
def testGetWinNowFunction_QPC(self):
if not (sys.platform.startswith(trace_time._PLATFORMS['windows'])
or sys.platform.startswith(trace_time._PLATFORMS['cygwin'])):
return True
# Test requires QPC to be available on platform.
if not trace_time.IsQPCUsable():
return True
self.assertGreater(trace_time.Now(), 0)
# Works even if QPC would work.
def testGetWinNowFunction_GetTickCount(self):
if not (sys.platform.startswith(trace_time._PLATFORMS['windows'])
or sys.platform.startswith(trace_time._PLATFORMS['cygwin'])):
return True
with self.ReplaceQPCCheck(lambda: False):
self.assertGreater(trace_time.Now(), 0)
# Linux tests.
def testGetClockGetTimeClockNumber_linux(self):
self.assertEquals(trace_time.GetClockGetTimeClockNumber('linux'), 1)
def testGetClockGetTimeClockNumber_freebsd(self):
self.assertEquals(trace_time.GetClockGetTimeClockNumber('freebsd'), 4)
def testGetClockGetTimeClockNumber_bsd(self):
self.assertEquals(trace_time.GetClockGetTimeClockNumber('bsd'), 3)
def testGetClockGetTimeClockNumber_sunos(self):
self.assertEquals(trace_time.GetClockGetTimeClockNumber('sunos5'), 4)
# Smoke Test.
def testMonotonic(self):
time_one = trace_time.Now()
for _ in xrange(1000):
time_two = trace_time.Now()
self.assertLessEqual(time_one, time_two)
time_one = time_two
if __name__ == '__main__':
logging.getLogger().setLevel(logging.DEBUG)
unittest.main(verbosity=2)
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