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8b30201f7d
cpython/Lib/test/test_time.py
Victor Stinner 8b30201f7d Issue #13846: Add time.monotonic(), monotonic clock.
2012-02-07 23:29:46 +01:00

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from test import support
import time
import unittest
import locale
import sysconfig
import sys
import platform
# Max year is only limited by the size of C int.
SIZEOF_INT = sysconfig.get_config_var('SIZEOF_INT') or 4
TIME_MAXYEAR = (1 << 8 * SIZEOF_INT - 1) - 1
TIME_MINYEAR = -TIME_MAXYEAR - 1
class TimeTestCase(unittest.TestCase):
def setUp(self):
self.t = time.time()
def test_data_attributes(self):
time.altzone
time.daylight
time.timezone
time.tzname
def test_clock(self):
time.clock()
@unittest.skipUnless(hasattr(time, 'clock_gettime'),
'need time.clock_gettime()')
def test_clock_realtime(self):
time.clock_gettime(time.CLOCK_REALTIME)
@unittest.skipUnless(hasattr(time, 'clock_gettime'),
'need time.clock_gettime()')
@unittest.skipUnless(hasattr(time, 'CLOCK_MONOTONIC'),
'need time.CLOCK_MONOTONIC')
def test_clock_monotonic(self):
a = time.clock_gettime(time.CLOCK_MONOTONIC)
b = time.clock_gettime(time.CLOCK_MONOTONIC)
self.assertLessEqual(a, b)
@unittest.skipUnless(hasattr(time, 'clock_getres'),
'need time.clock_getres()')
def test_clock_getres(self):
res = time.clock_getres(time.CLOCK_REALTIME)
self.assertGreater(res, 0.0)
self.assertLessEqual(res, 1.0)
def test_conversions(self):
self.assertEqual(time.ctime(self.t),
time.asctime(time.localtime(self.t)))
self.assertEqual(int(time.mktime(time.localtime(self.t))),
int(self.t))
def test_sleep(self):
self.assertRaises(ValueError, time.sleep, -2)
self.assertRaises(ValueError, time.sleep, -1)
time.sleep(1.2)
def test_strftime(self):
tt = time.gmtime(self.t)
for directive in ('a', 'A', 'b', 'B', 'c', 'd', 'H', 'I',
'j', 'm', 'M', 'p', 'S',
'U', 'w', 'W', 'x', 'X', 'y', 'Y', 'Z', '%'):
format = ' %' + directive
try:
time.strftime(format, tt)
except ValueError:
self.fail('conversion specifier: %r failed.' % format)
# Issue #10762: Guard against invalid/non-supported format string
# so that Python don't crash (Windows crashes when the format string
# input to [w]strftime is not kosher.
if sys.platform.startswith('win'):
with self.assertRaises(ValueError):
time.strftime('%f')
def _bounds_checking(self, func):
# Make sure that strftime() checks the bounds of the various parts
# of the time tuple (0 is valid for *all* values).
# The year field is tested by other test cases above
# Check month [1, 12] + zero support
func((1900, 0, 1, 0, 0, 0, 0, 1, -1))
func((1900, 12, 1, 0, 0, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, -1, 1, 0, 0, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 13, 1, 0, 0, 0, 0, 1, -1))
# Check day of month [1, 31] + zero support
func((1900, 1, 0, 0, 0, 0, 0, 1, -1))
func((1900, 1, 31, 0, 0, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, -1, 0, 0, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 32, 0, 0, 0, 0, 1, -1))
# Check hour [0, 23]
func((1900, 1, 1, 23, 0, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, -1, 0, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, 24, 0, 0, 0, 1, -1))
# Check minute [0, 59]
func((1900, 1, 1, 0, 59, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, -1, 0, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, 60, 0, 0, 1, -1))
# Check second [0, 61]
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, 0, -1, 0, 1, -1))
# C99 only requires allowing for one leap second, but Python's docs say
# allow two leap seconds (0..61)
func((1900, 1, 1, 0, 0, 60, 0, 1, -1))
func((1900, 1, 1, 0, 0, 61, 0, 1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, 0, 62, 0, 1, -1))
# No check for upper-bound day of week;
# value forced into range by a ``% 7`` calculation.
# Start check at -2 since gettmarg() increments value before taking
# modulo.
self.assertEqual(func((1900, 1, 1, 0, 0, 0, -1, 1, -1)),
func((1900, 1, 1, 0, 0, 0, +6, 1, -1)))
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, 0, 0, -2, 1, -1))
# Check day of the year [1, 366] + zero support
func((1900, 1, 1, 0, 0, 0, 0, 0, -1))
func((1900, 1, 1, 0, 0, 0, 0, 366, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, 0, 0, 0, -1, -1))
self.assertRaises(ValueError, func,
(1900, 1, 1, 0, 0, 0, 0, 367, -1))
def test_strftime_bounding_check(self):
self._bounds_checking(lambda tup: time.strftime('', tup))
def test_default_values_for_zero(self):
# Make sure that using all zeros uses the proper default
# values. No test for daylight savings since strftime() does
# not change output based on its value and no test for year
# because systems vary in their support for year 0.
expected = "2000 01 01 00 00 00 1 001"
with support.check_warnings():
result = time.strftime("%Y %m %d %H %M %S %w %j", (2000,)+(0,)*8)
self.assertEqual(expected, result)
def test_strptime(self):
# Should be able to go round-trip from strftime to strptime without
# throwing an exception.
tt = time.gmtime(self.t)
for directive in ('a', 'A', 'b', 'B', 'c', 'd', 'H', 'I',
'j', 'm', 'M', 'p', 'S',
'U', 'w', 'W', 'x', 'X', 'y', 'Y', 'Z', '%'):
format = '%' + directive
strf_output = time.strftime(format, tt)
try:
time.strptime(strf_output, format)
except ValueError:
self.fail("conversion specifier %r failed with '%s' input." %
(format, strf_output))
def test_strptime_bytes(self):
# Make sure only strings are accepted as arguments to strptime.
self.assertRaises(TypeError, time.strptime, b'2009', "%Y")
self.assertRaises(TypeError, time.strptime, '2009', b'%Y')
def test_asctime(self):
time.asctime(time.gmtime(self.t))
# Max year is only limited by the size of C int.
for bigyear in TIME_MAXYEAR, TIME_MINYEAR:
asc = time.asctime((bigyear, 6, 1) + (0,) * 6)
self.assertEqual(asc[-len(str(bigyear)):], str(bigyear))
self.assertRaises(OverflowError, time.asctime,
(TIME_MAXYEAR + 1,) + (0,) * 8)
self.assertRaises(OverflowError, time.asctime,
(TIME_MINYEAR - 1,) + (0,) * 8)
self.assertRaises(TypeError, time.asctime, 0)
self.assertRaises(TypeError, time.asctime, ())
self.assertRaises(TypeError, time.asctime, (0,) * 10)
def test_asctime_bounding_check(self):
self._bounds_checking(time.asctime)
def test_ctime(self):
t = time.mktime((1973, 9, 16, 1, 3, 52, 0, 0, -1))
self.assertEqual(time.ctime(t), 'Sun Sep 16 01:03:52 1973')
t = time.mktime((2000, 1, 1, 0, 0, 0, 0, 0, -1))
self.assertEqual(time.ctime(t), 'Sat Jan 1 00:00:00 2000')
for year in [-100, 100, 1000, 2000, 10000]:
try:
testval = time.mktime((year, 1, 10) + (0,)*6)
except (ValueError, OverflowError):
# If mktime fails, ctime will fail too. This may happen
# on some platforms.
pass
else:
self.assertEqual(time.ctime(testval)[20:], str(year))
@unittest.skipUnless(hasattr(time, "tzset"),
"time module has no attribute tzset")
def test_tzset(self):
from os import environ
# Epoch time of midnight Dec 25th 2002. Never DST in northern
# hemisphere.
xmas2002 = 1040774400.0
# These formats are correct for 2002, and possibly future years
# This format is the 'standard' as documented at:
# http://www.opengroup.org/onlinepubs/007904975/basedefs/xbd_chap08.html
# They are also documented in the tzset(3) man page on most Unix
# systems.
eastern = 'EST+05EDT,M4.1.0,M10.5.0'
victoria = 'AEST-10AEDT-11,M10.5.0,M3.5.0'
utc='UTC+0'
org_TZ = environ.get('TZ',None)
try:
# Make sure we can switch to UTC time and results are correct
# Note that unknown timezones default to UTC.
# Note that altzone is undefined in UTC, as there is no DST
environ['TZ'] = eastern
time.tzset()
environ['TZ'] = utc
time.tzset()
self.assertEqual(
time.gmtime(xmas2002), time.localtime(xmas2002)
)
self.assertEqual(time.daylight, 0)
self.assertEqual(time.timezone, 0)
self.assertEqual(time.localtime(xmas2002).tm_isdst, 0)
# Make sure we can switch to US/Eastern
environ['TZ'] = eastern
time.tzset()
self.assertNotEqual(time.gmtime(xmas2002), time.localtime(xmas2002))
self.assertEqual(time.tzname, ('EST', 'EDT'))
self.assertEqual(len(time.tzname), 2)
self.assertEqual(time.daylight, 1)
self.assertEqual(time.timezone, 18000)
self.assertEqual(time.altzone, 14400)
self.assertEqual(time.localtime(xmas2002).tm_isdst, 0)
self.assertEqual(len(time.tzname), 2)
# Now go to the southern hemisphere.
environ['TZ'] = victoria
time.tzset()
self.assertNotEqual(time.gmtime(xmas2002), time.localtime(xmas2002))
# Issue #11886: Australian Eastern Standard Time (UTC+10) is called
# "EST" (as Eastern Standard Time, UTC-5) instead of "AEST"
# (non-DST timezone), and "EDT" instead of "AEDT" (DST timezone),
# on some operating systems (e.g. FreeBSD), which is wrong. See for
# example this bug:
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=93810
self.assertIn(time.tzname[0], ('AEST' 'EST'), time.tzname[0])
self.assertTrue(time.tzname[1] in ('AEDT', 'EDT'), str(time.tzname[1]))
self.assertEqual(len(time.tzname), 2)
self.assertEqual(time.daylight, 1)
self.assertEqual(time.timezone, -36000)
self.assertEqual(time.altzone, -39600)
self.assertEqual(time.localtime(xmas2002).tm_isdst, 1)
finally:
# Repair TZ environment variable in case any other tests
# rely on it.
if org_TZ is not None:
environ['TZ'] = org_TZ
elif 'TZ' in environ:
del environ['TZ']
time.tzset()
def test_insane_timestamps(self):
# It's possible that some platform maps time_t to double,
# and that this test will fail there. This test should
# exempt such platforms (provided they return reasonable
# results!).
for func in time.ctime, time.gmtime, time.localtime:
for unreasonable in -1e200, 1e200:
self.assertRaises(ValueError, func, unreasonable)
def test_ctime_without_arg(self):
# Not sure how to check the values, since the clock could tick
# at any time. Make sure these are at least accepted and
# don't raise errors.
time.ctime()
time.ctime(None)
def test_gmtime_without_arg(self):
gt0 = time.gmtime()
gt1 = time.gmtime(None)
t0 = time.mktime(gt0)
t1 = time.mktime(gt1)
self.assertAlmostEqual(t1, t0, delta=0.2)
def test_localtime_without_arg(self):
lt0 = time.localtime()
lt1 = time.localtime(None)
t0 = time.mktime(lt0)
t1 = time.mktime(lt1)
self.assertAlmostEqual(t1, t0, delta=0.2)
def test_mktime(self):
# Issue #1726687
for t in (-2, -1, 0, 1):
try:
tt = time.localtime(t)
except (OverflowError, OSError):
pass
else:
self.assertEqual(time.mktime(tt), t)
# Issue #13309: passing extreme values to mktime() or localtime()
# borks the glibc's internal timezone data.
@unittest.skipUnless(platform.libc_ver()[0] != 'glibc',
"disabled because of a bug in glibc. Issue #13309")
def test_mktime_error(self):
# It may not be possible to reliably make mktime return error
# on all platfom. This will make sure that no other exception
# than OverflowError is raised for an extreme value.
tt = time.gmtime(self.t)
tzname = time.strftime('%Z', tt)
self.assertNotEqual(tzname, 'LMT')
try:
time.mktime((-1, 1, 1, 0, 0, 0, -1, -1, -1))
except OverflowError:
pass
self.assertEqual(time.strftime('%Z', tt), tzname)
@unittest.skipUnless(hasattr(time, 'monotonic'),
'need time.monotonic()')
def test_monotonic(self):
t1 = time.monotonic()
t2 = time.monotonic()
self.assertGreaterEqual(t2, t1)
t1 = time.monotonic()
time.sleep(0.1)
t2 = time.monotonic()
dt = t2 - t1
self.assertGreater(t2, t1)
self.assertAlmostEqual(dt, 0.1, delta=0.2)
def test_wallclock(self):
t1 = time.wallclock()
t2 = time.wallclock()
# may fail if the system clock was changed
self.assertGreaterEqual(t2, t1)
t1 = time.wallclock()
time.sleep(0.1)
t2 = time.wallclock()
dt = t2 - t1
# may fail if the system clock was changed
self.assertGreater(t2, t1)
self.assertAlmostEqual(dt, 0.1, delta=0.2)
def test_localtime_failure(self):
# Issue #13847: check for localtime() failure
invalid_time_t = None
for time_t in (-1, 2**30, 2**33, 2**60):
try:
time.localtime(time_t)
except ValueError as err:
if str(err) == "timestamp out of range for platform time_t":
self.skipTest("need 64-bit time_t")
else:
raise
except OSError:
invalid_time_t = time_t
break
if invalid_time_t is None:
self.skipTest("unable to find an invalid time_t value")
self.assertRaises(OSError, time.localtime, invalid_time_t)
self.assertRaises(OSError, time.ctime, invalid_time_t)
class TestLocale(unittest.TestCase):
def setUp(self):
self.oldloc = locale.setlocale(locale.LC_ALL)
def tearDown(self):
locale.setlocale(locale.LC_ALL, self.oldloc)
def test_bug_3061(self):
try:
tmp = locale.setlocale(locale.LC_ALL, "fr_FR")
except locale.Error:
# skip this test
return
# This should not cause an exception
time.strftime("%B", (2009,2,1,0,0,0,0,0,0))
class _BaseYearTest(unittest.TestCase):
def yearstr(self, y):
raise NotImplementedError()
class _TestAsctimeYear:
_format = '%d'
def yearstr(self, y):
return time.asctime((y,) + (0,) * 8).split()[-1]
def test_large_year(self):
# Check that it doesn't crash for year > 9999
self.assertEqual(self.yearstr(12345), '12345')
self.assertEqual(self.yearstr(123456789), '123456789')
class _TestStrftimeYear:
# Issue 13305: For years < 1000, the value is not always
# padded to 4 digits across platforms. The C standard
# assumes year >= 1900, so it does not specify the number
# of digits.
if time.strftime('%Y', (1,) + (0,) * 8) == '0001':
_format = '%04d'
else:
_format = '%d'
def yearstr(self, y):
return time.strftime('%Y', (y,) + (0,) * 8)
def test_4dyear(self):
# Check that we can return the zero padded value.
if self._format == '%04d':
self.test_year('%04d')
else:
def year4d(y):
return time.strftime('%4Y', (y,) + (0,) * 8)
self.test_year('%04d', func=year4d)
def skip_if_not_supported(y):
msg = "strftime() is limited to [1; 9999] with Visual Studio"
# Check that it doesn't crash for year > 9999
try:
time.strftime('%Y', (y,) + (0,) * 8)
except ValueError:
cond = False
else:
cond = True
return unittest.skipUnless(cond, msg)
@skip_if_not_supported(10000)
def test_large_year(self):
return super().test_large_year()
@skip_if_not_supported(0)
def test_negative(self):
return super().test_negative()
del skip_if_not_supported
class _Test4dYear(_BaseYearTest):
_format = '%d'
def test_year(self, fmt=None, func=None):
fmt = fmt or self._format
func = func or self.yearstr
self.assertEqual(func(1), fmt % 1)
self.assertEqual(func(68), fmt % 68)
self.assertEqual(func(69), fmt % 69)
self.assertEqual(func(99), fmt % 99)
self.assertEqual(func(999), fmt % 999)
self.assertEqual(func(9999), fmt % 9999)
def test_large_year(self):
self.assertEqual(self.yearstr(12345), '12345')
self.assertEqual(self.yearstr(123456789), '123456789')
self.assertEqual(self.yearstr(TIME_MAXYEAR), str(TIME_MAXYEAR))
self.assertRaises(OverflowError, self.yearstr, TIME_MAXYEAR + 1)
def test_negative(self):
self.assertEqual(self.yearstr(-1), self._format % -1)
self.assertEqual(self.yearstr(-1234), '-1234')
self.assertEqual(self.yearstr(-123456), '-123456')
self.assertEqual(self.yearstr(-123456789), str(-123456789))
self.assertEqual(self.yearstr(-1234567890), str(-1234567890))
self.assertEqual(self.yearstr(TIME_MINYEAR + 1900), str(TIME_MINYEAR + 1900))
# Issue #13312: it may return wrong value for year < TIME_MINYEAR + 1900
# Skip the value test, but check that no error is raised
self.yearstr(TIME_MINYEAR)
# self.assertEqual(self.yearstr(TIME_MINYEAR), str(TIME_MINYEAR))
self.assertRaises(OverflowError, self.yearstr, TIME_MINYEAR - 1)
class TestAsctime4dyear(_TestAsctimeYear, _Test4dYear):
pass
class TestStrftime4dyear(_TestStrftimeYear, _Test4dYear):
pass
def test_main():
support.run_unittest(
TimeTestCase,
TestLocale,
TestAsctime4dyear,
TestStrftime4dyear)
if __name__ == "__main__":
test_main()
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