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"""Tests for the tzif library."""
import datetime
from unittest.mock import patch
import zoneinfo
import pytest
from ical.tzif import timezoneinfo, tz_rule
IGNORED_TIMEZONES = {
"Asia/Hanoi", # Not in tzdata
}
def test_invalid_zoneinfo() -> None:
"""Verify exception handling for an invalid timezone."""
with pytest.raises(timezoneinfo.TimezoneInfoError, match="Unable to find timezone"):
timezoneinfo.read("invalid")
@pytest.mark.parametrize(
"key,dtstarts,expected_tzname,expected_offset",
[
(
"America/Los_Angeles",
[
datetime.datetime(2021, 3, 14, 1, 59, 0),
datetime.datetime(2021, 11, 7, 2, 0, 0),
datetime.datetime(2022, 3, 13, 1, 59, 0),
datetime.datetime(2022, 11, 6, 2, 0, 0),
datetime.datetime(2023, 3, 12, 1, 59, 0),
datetime.datetime(2023, 11, 5, 2, 0, 0),
],
"PST",
datetime.timedelta(hours=-8),
),
(
"America/Los_Angeles",
[
datetime.datetime(2021, 3, 14, 2, 0, 0),
datetime.datetime(2021, 11, 7, 1, 59, 0),
datetime.datetime(2022, 3, 13, 2, 0, 0),
datetime.datetime(2022, 11, 6, 1, 59, 0),
datetime.datetime(2023, 3, 12, 2, 0, 0),
datetime.datetime(2023, 11, 5, 1, 59, 0),
],
"PDT",
datetime.timedelta(hours=-7),
),
(
"Europe/Warsaw",
[
datetime.datetime(2021, 3, 28, 1, 59, 0),
datetime.datetime(2021, 10, 31, 3, 0, 0),
datetime.datetime(2022, 3, 27, 1, 59, 0),
datetime.datetime(2022, 10, 30, 3, 0, 0),
datetime.datetime(2023, 3, 26, 1, 59, 0),
datetime.datetime(2023, 10, 29, 3, 0, 0),
datetime.datetime(2024, 3, 31, 1, 59, 0),
datetime.datetime(2024, 10, 27, 3, 0, 0),
],
"CET",
datetime.timedelta(hours=1),
),
(
"Europe/Warsaw",
[
datetime.datetime(2021, 3, 28, 2, 0, 0),
datetime.datetime(2021, 10, 31, 2, 59, 0),
datetime.datetime(2022, 3, 27, 2, 0, 0),
datetime.datetime(2022, 10, 30, 2, 59, 0),
datetime.datetime(2023, 3, 26, 2, 0, 0),
datetime.datetime(2023, 10, 29, 2, 59, 0),
datetime.datetime(2024, 3, 31, 2, 0, 0),
datetime.datetime(2024, 10, 27, 2, 59, 0),
],
"CEST",
datetime.timedelta(hours=2),
),
(
"Asia/Tokyo",
[
# Fixed offset anytime of year
datetime.datetime(2021, 1, 1, 0, 0, 0),
datetime.datetime(2022, 3, 1, 0, 0, 0),
datetime.datetime(2022, 6, 1, 0, 0, 0),
datetime.datetime(2023, 7, 1, 0, 0, 0),
datetime.datetime(2023, 12, 1, 0, 0, 0),
],
"JST",
datetime.timedelta(hours=9),
),
(
"America/St_Thomas",
[
# Fixed offset anytime of year
datetime.datetime(2021, 1, 1, 0, 0, 0),
datetime.datetime(2022, 3, 1, 0, 0, 0),
datetime.datetime(2022, 6, 1, 0, 0, 0),
datetime.datetime(2023, 7, 1, 0, 0, 0),
datetime.datetime(2023, 12, 1, 0, 0, 0),
],
"AST",
datetime.timedelta(hours=-4),
),
],
)
def test_tzinfo(
key: str,
dtstarts: list[datetime.datetime],
expected_tzname: str,
expected_offset: datetime.timedelta,
) -> None:
"""Test TzInfo implementation for known date/times."""
tz_info = timezoneinfo.read_tzinfo(key)
for dtstart in dtstarts:
value = dtstart.replace(tzinfo=tz_info)
assert tz_info.tzname(value) == expected_tzname, f"For {dtstart}"
assert tz_info.utcoffset(value) == expected_offset, f"For {dtstart}"
assert not tz_info.utcoffset(None)
assert not tz_info.tzname(None)
assert not tz_info.dst(None)
def test_rrule_str() -> None:
"""Test rule implementations for std and dst."""
result = timezoneinfo.read("America/New_York")
assert result.rule
assert result.rule.dst_start
assert isinstance(result.rule.dst_start, tz_rule.RuleDate)
assert result.rule.dst_start.rrule_str == "FREQ=YEARLY;BYMONTH=3;BYDAY=2SU"
assert result.rule.dst_end
assert isinstance(result.rule.dst_end, tz_rule.RuleDate)
assert result.rule.dst_end.rrule_str == "FREQ=YEARLY;BYMONTH=11;BYDAY=1SU"
@pytest.mark.parametrize("key", zoneinfo.available_timezones())
def test_all_zoneinfo(key: str) -> None:
"""Verify that all available timezones in the system have valid tzdata."""
if key.startswith("System") or key == "localtime" or key in IGNORED_TIMEZONES:
return
result = timezoneinfo.read(key)
assert result.rule
if result.rule.dst_start:
assert result.rule.dst_end
assert isinstance(result.rule.dst_start, tz_rule.RuleDate)
assert isinstance(result.rule.dst_end, tz_rule.RuleDate)
# Verify a rule can be constructed
assert next(iter(result.rule.dst_start.as_rrule()))
assert next(iter(result.rule.dst_end.as_rrule()))
else:
# Fixed offset
assert result.rule
assert result.rule.std
assert result.rule.std.name
assert not result.rule.dst
# Verify there is a paresable tz rule
timezoneinfo.TzInfo.from_timezoneinfo(result)
def test_read_tzinfo_value_error() -> None:
"""Test TzInfo implementation for known date/times."""
with (
patch("ical.tzif.timezoneinfo._read_tzdata_timezones", return_value=["X/Y"]),
patch("ical.tzif.timezoneinfo._find_tzfile"),
patch(
"ical.tzif.timezoneinfo.read_tzif",
side_effect=ValueError("zoneinfo file did not contain magic header"),
),
pytest.raises(
timezoneinfo.TimezoneInfoError, match="Unable to load tzdata file: X/Y"
),
):
timezoneinfo.read_tzinfo("X/Y")
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