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import copy
import functools
import pickle
import sys
import unittest
from datetime import datetime, timedelta, timezone, tzinfo
from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
from pydantic_core import SchemaValidator, TzInfo, core_schema
class _ALWAYS_EQ:
"""
Object that is equal to anything.
"""
def __eq__(self, other):
return True
def __ne__(self, other):
return False
ALWAYS_EQ = _ALWAYS_EQ()
@functools.total_ordering
class _LARGEST:
"""
Object that is greater than anything (except itself).
"""
def __eq__(self, other):
return isinstance(other, _LARGEST)
def __lt__(self, other):
return False
LARGEST = _LARGEST()
@functools.total_ordering
class _SMALLEST:
"""
Object that is less than anything (except itself).
"""
def __eq__(self, other):
return isinstance(other, _SMALLEST)
def __gt__(self, other):
return False
SMALLEST = _SMALLEST()
pickle_choices = [(pickle, pickle, proto) for proto in range(pickle.HIGHEST_PROTOCOL + 1)]
HOUR = timedelta(hours=1).total_seconds()
ZERO = timedelta(0).total_seconds()
def first_sunday_on_or_after(dt):
days_to_go = 6 - dt.weekday()
if days_to_go:
dt += timedelta(days_to_go)
return dt
DSTSTART = datetime(1, 4, 1, 2)
DSTEND = datetime(1, 10, 25, 1)
class TestTzInfo(unittest.TestCase):
"""Adapted from CPython `timezone` tests
Original tests are located here https://github.com/python/cpython/blob/a0bb4a39d1ca10e4a75f50a9fbe90cc9db28d29e/Lib/test/datetimetester.py#L256
"""
def setUp(self):
self.ACDT = TzInfo(timedelta(hours=9.5).total_seconds())
self.EST = TzInfo(-timedelta(hours=5).total_seconds())
self.UTC = TzInfo(timedelta(0).total_seconds())
self.DT = datetime(2010, 1, 1)
def test_str(self):
for tz in [self.ACDT, self.EST]:
self.assertEqual(str(tz), tz.tzname(None))
def test_constructor(self):
for subminute in [timedelta(microseconds=1), timedelta(seconds=1)]:
tz = TzInfo(subminute.total_seconds())
self.assertNotEqual(tz.utcoffset(None) % timedelta(minutes=1), 0)
# invalid offsets
for invalid in [timedelta(1, 1), timedelta(1)]:
self.assertRaises(ValueError, TzInfo, invalid.total_seconds())
self.assertRaises(ValueError, TzInfo, -invalid.total_seconds())
with self.assertRaises(TypeError):
TzInfo(None)
with self.assertRaises(TypeError):
TzInfo(timedelta(seconds=42))
with self.assertRaises(TypeError):
TzInfo(ZERO, None)
with self.assertRaises(TypeError):
TzInfo(ZERO, 42)
with self.assertRaises(TypeError):
TzInfo(ZERO, 'ABC', 'extra')
def test_inheritance(self):
self.assertIsInstance(self.EST, tzinfo)
def test_utcoffset(self):
dummy = self.DT
for h in [0, 1.5, 12]:
offset = h * HOUR
self.assertEqual(timedelta(seconds=offset), TzInfo(offset).utcoffset(dummy))
self.assertEqual(timedelta(seconds=-offset), TzInfo(-offset).utcoffset(dummy))
self.assertEqual(self.EST.utcoffset(''), timedelta(hours=-5))
self.assertEqual(self.EST.utcoffset(5), timedelta(hours=-5))
def test_dst(self):
self.EST.dst('') is None
self.EST.dst(5) is None
def test_tzname(self):
self.assertEqual('-05:00', TzInfo(-5 * HOUR).tzname(None))
self.assertEqual('+09:30', TzInfo(9.5 * HOUR).tzname(None))
self.assertEqual('-00:01', TzInfo(timedelta(minutes=-1).total_seconds()).tzname(None))
# Sub-minute offsets:
self.assertEqual('+01:06:40', TzInfo(timedelta(0, 4000).total_seconds()).tzname(None))
self.assertEqual('-01:06:40', TzInfo(-timedelta(0, 4000).total_seconds()).tzname(None))
self.assertEqual('+01:06:40', TzInfo(timedelta(0, 4000, 1).total_seconds()).tzname(None))
self.assertEqual('-01:06:40', TzInfo(-timedelta(0, 4000, 1).total_seconds()).tzname(None))
self.assertEqual(self.EST.tzname(''), '-05:00')
self.assertEqual(self.EST.tzname(5), '-05:00')
def test_fromutc(self):
for tz in [self.EST, self.ACDT]:
utctime = self.DT.replace(tzinfo=tz)
local = tz.fromutc(utctime)
self.assertEqual(local - utctime, tz.utcoffset(local))
self.assertEqual(local, self.DT.replace(tzinfo=timezone.utc))
def test_comparison(self):
self.assertNotEqual(TzInfo(ZERO), TzInfo(HOUR))
self.assertEqual(TzInfo(HOUR), TzInfo(HOUR))
self.assertFalse(TzInfo(ZERO) < TzInfo(ZERO))
self.assertIn(TzInfo(ZERO), {TzInfo(ZERO)})
self.assertTrue(TzInfo(ZERO) is not None)
self.assertFalse(TzInfo(ZERO) is None)
tz = TzInfo(ZERO)
self.assertTrue(tz == ALWAYS_EQ)
self.assertFalse(tz != ALWAYS_EQ)
self.assertTrue(tz < LARGEST)
self.assertFalse(tz > LARGEST)
self.assertTrue(tz <= LARGEST)
self.assertFalse(tz >= LARGEST)
self.assertFalse(tz < SMALLEST)
self.assertTrue(tz > SMALLEST)
self.assertFalse(tz <= SMALLEST)
self.assertTrue(tz >= SMALLEST)
# offset based comparion tests for tzinfo derived classes like datetime.timezone.
utcdatetime = self.DT.replace(tzinfo=timezone.utc)
self.assertTrue(tz == utcdatetime.tzinfo)
estdatetime = self.DT.replace(tzinfo=timezone(-timedelta(hours=5)))
self.assertTrue(self.EST == estdatetime.tzinfo)
self.assertTrue(tz > estdatetime.tzinfo)
if sys.platform == 'linux':
try:
europe_london = ZoneInfo('Europe/London')
except ZoneInfoNotFoundError:
# tz data not available
pass
else:
self.assertFalse(tz == europe_london)
with self.assertRaises(TypeError):
tz > europe_london
def test_copy(self):
for tz in self.ACDT, self.EST:
tz_copy = copy.copy(tz)
self.assertEqual(tz_copy, tz)
def test_deepcopy(self):
for tz in self.ACDT, self.EST:
tz_copy = copy.deepcopy(tz)
self.assertEqual(tz_copy, tz)
def test_offset_boundaries(self):
# Test timedeltas close to the boundaries
time_deltas = [timedelta(hours=23, minutes=59), timedelta(hours=23, minutes=59, seconds=59)]
time_deltas.extend([-delta for delta in time_deltas])
for delta in time_deltas:
with self.subTest(test_type='good', delta=delta):
print(delta.total_seconds())
TzInfo(delta.total_seconds())
# Test timedeltas on and outside the boundaries
bad_time_deltas = [timedelta(hours=24), timedelta(hours=24, microseconds=1)]
bad_time_deltas.extend([-delta for delta in bad_time_deltas])
for delta in bad_time_deltas:
with self.subTest(test_type='bad', delta=delta):
with self.assertRaises(ValueError):
TzInfo(delta.total_seconds())
def test_no_args_constructor(self):
# Test that TzInfo can be constructed without arguments
tz = TzInfo()
self.assertEqual(tz.utcoffset(None), timedelta(0))
self.assertEqual(str(tz), 'UTC')
def test_pickle(self):
# Test that TzInfo can be pickled and unpickled
for tz in self.ACDT, self.EST, self.UTC:
for pickler, unpickler, proto in pickle_choices:
with self.subTest(tz=tz, proto=proto):
pickled = pickler.dumps(tz, proto)
unpickled = unpickler.loads(pickled)
self.assertEqual(tz, unpickled)
self.assertEqual(tz.utcoffset(None), unpickled.utcoffset(None))
def test_tzinfo_could_be_reused():
class Model:
value: datetime
v = SchemaValidator(
core_schema.model_schema(
Model, core_schema.model_fields_schema({'value': core_schema.model_field(core_schema.datetime_schema())})
)
)
m = v.validate_python({'value': '2015-10-21T15:28:00.000000+01:00'})
target = datetime(1955, 11, 12, 14, 38, tzinfo=m.value.tzinfo)
assert target == datetime(1955, 11, 12, 14, 38, tzinfo=timezone(timedelta(hours=1)))
now = datetime.now(tz=m.value.tzinfo)
assert isinstance(now, datetime)
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