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"""Tests for the tzif library."""
import datetime
from typing import cast, Any
import pytest
from ical.tzif import tz_rule
TEST_DATETIME = datetime.datetime(2022, 1, 1)
def expand_rule(test_rule: tz_rule.RuleDate) -> datetime.datetime:
"""Test method to expand a rule to a single value."""
return cast(datetime.datetime, next(iter(test_rule.as_rrule(TEST_DATETIME))))
def test_standard() -> None:
"""Test standard time with no daylight savings time."""
rule = tz_rule.parse_tz_rule("EST5")
assert rule.std.name == "EST"
assert rule.std.offset == datetime.timedelta(hours=-5)
assert rule.dst is None
assert rule.dst_start is None
assert rule.dst_end is None
def test_standard_plus_offset() -> None:
"""Test standard time with an offset with an explicit plus."""
rule = tz_rule.parse_tz_rule("EST+5")
assert rule.std.name == "EST"
assert rule.std.offset == datetime.timedelta(hours=-5)
assert rule.dst is None
assert rule.dst_start is None
assert rule.dst_end is None
def test_hours_minutes_offset() -> None:
"""Test standard time offset with hours and minutes."""
rule = tz_rule.parse_tz_rule("EX05:30")
assert rule.std.name == "EX"
assert rule.std.offset == datetime.timedelta(hours=-5, minutes=-30)
assert rule.dst is None
assert rule.dst_start is None
assert rule.dst_end is None
def test_hours_minutes_seconds_offset() -> None:
"""Test standard time offset with hours, minutes, and seconds."""
rule = tz_rule.parse_tz_rule("EX05:30:20")
assert rule.std.name == "EX"
assert rule.std.offset == datetime.timedelta(hours=-5, minutes=-30, seconds=-20)
assert rule.dst is None
assert rule.dst_start is None
assert rule.dst_end is None
def test_standard_minus_offset() -> None:
"""Test standard time offset with a negative offset."""
rule = tz_rule.parse_tz_rule("JST-9")
assert rule.std.name == "JST"
assert rule.std.offset == datetime.timedelta(hours=9)
assert rule.dst is None
assert rule.dst_start is None
assert rule.dst_end is None
def test_dst_implicit_offset() -> None:
"""Test daylight savings time with an implicit offset."""
rule = tz_rule.parse_tz_rule("EST5EDT")
assert rule.std.name == "EST"
assert rule.std.offset == datetime.timedelta(hours=-5)
assert rule.dst
assert rule.dst.name == "EDT"
assert rule.dst.offset == datetime.timedelta(hours=-4)
assert rule.dst_start is None
assert rule.dst_end is None
def test_standard_dst_implied_offset() -> None:
"""Test standard time with an offset with an explicit plus."""
rule = tz_rule.parse_tz_rule("PST8PDT")
assert rule.std.name == "PST"
assert rule.std.offset == datetime.timedelta(hours=-8)
assert rule.dst
assert rule.dst.name == "PDT"
assert rule.dst.offset == datetime.timedelta(hours=-7)
assert rule.dst_start is None
assert rule.dst_end is None
def test_dst_explicit_offset() -> None:
"""Test standard time with no daylight savings time."""
rule = tz_rule.parse_tz_rule("EST5EDT4")
assert rule.std.name == "EST"
assert rule.std.offset == datetime.timedelta(hours=-5)
assert rule.dst
assert rule.dst.name == "EDT"
assert rule.dst.offset == datetime.timedelta(hours=-4)
assert rule.dst_start is None
assert rule.dst_end is None
def test_dst_rules() -> None:
"""Test daylight savings start/end value."""
rule = tz_rule.parse_tz_rule("EST+5EDT,M3.2.0/2,M11.1.0/2")
assert rule.std.name == "EST"
assert rule.std.offset == datetime.timedelta(hours=-5)
assert rule.dst
assert rule.dst.name == "EDT"
assert rule.dst.offset == datetime.timedelta(hours=-4)
assert rule.dst_start
assert isinstance(rule.dst_start, tz_rule.RuleDate)
assert rule.dst_start.month == 3
assert rule.dst_start.week_of_month == 2
assert rule.dst_start.day_of_week == 0
assert rule.dst_start.time == datetime.timedelta(hours=2)
assert rule.dst_end
assert isinstance(rule.dst_end, tz_rule.RuleDate)
assert rule.dst_end.month == 11
assert rule.dst_end.week_of_month == 1
assert rule.dst_end.day_of_week == 0
assert rule.dst_end.time == datetime.timedelta(hours=2)
assert next(
iter(rule.dst_start.as_rrule(datetime.datetime(2022, 1, 1)))
) == datetime.datetime(2022, 3, 13, 2, 0, 0)
assert next(
iter(rule.dst_end.as_rrule(datetime.datetime(2022, 1, 1)))
) == datetime.datetime(2022, 11, 6, 2, 0, 0)
assert rule.dst_start.rrule_str == "FREQ=YEARLY;BYMONTH=3;BYDAY=2SU"
assert rule.dst_end.rrule_str == "FREQ=YEARLY;BYMONTH=11;BYDAY=1SU"
def test_dst_implement_time_rules() -> None:
"""Test daylight savings values rules with no explicit time."""
rule = tz_rule.parse_tz_rule("EST+5EDT,M3.2.0,M11.1.0")
assert rule.std.name == "EST"
assert rule.std.offset == datetime.timedelta(hours=-5)
assert rule.dst
assert rule.dst.name == "EDT"
assert rule.dst.offset == datetime.timedelta(hours=-4)
assert rule.dst_start
assert isinstance(rule.dst_start, tz_rule.RuleDate)
assert rule.dst_start.month == 3
assert rule.dst_start.week_of_month == 2
assert rule.dst_start.day_of_week == 0
assert rule.dst_start.time == datetime.timedelta(hours=2)
assert rule.dst_end
assert isinstance(rule.dst_end, tz_rule.RuleDate)
assert rule.dst_end.month == 11
assert rule.dst_end.week_of_month == 1
assert rule.dst_end.day_of_week == 0
assert rule.dst_end.time == datetime.timedelta(hours=2)
@pytest.mark.parametrize(
"tz_string",
[
"",
"1234",
"EST+5EDT,M3.2.0/2",
"EST+5EDT,M3.2.0/2,M11.1.0/2,M3",
"EST+5EDT,3.2.0/2,M11.1.0/2",
"EST+5EDT,M3.2/2,M11.1.0/2",
"EST+5EDT,M3.2.0.4/2,M11.1.0/2",
],
)
def test_invalid(tz_string: str) -> None:
"""Test an invalid rule occurrence"""
with pytest.raises(ValueError, match="Unable to parse TZ string"):
tz_rule.parse_tz_rule(tz_string)
def test_tz_offset() -> None:
"""Test standard time offset with hours and minutes."""
rule = tz_rule.parse_tz_rule("<-03>3<-02>,M3.5.0/-2,M10.5.0/-1")
assert rule.std.name == "<-03>"
assert rule.std.offset == datetime.timedelta(hours=-3)
assert rule.dst
assert rule.dst.name == "<-02>"
assert rule.dst.offset == datetime.timedelta(hours=-2)
assert rule.dst_start
assert isinstance(rule.dst_start, tz_rule.RuleDate)
assert rule.dst_start.month == 3
assert rule.dst_start.week_of_month == 5
assert rule.dst_start.day_of_week == 0
assert rule.dst_start.time == datetime.timedelta(hours=-2)
assert rule.dst_end
assert isinstance(rule.dst_end, tz_rule.RuleDate)
assert rule.dst_end.month == 10
assert rule.dst_end.week_of_month == 5
assert rule.dst_end.day_of_week == 0
assert rule.dst_end.time == datetime.timedelta(hours=-1)
def test_iran_rule_offset() -> None:
"""Test a more complex timezone rule."""
rule = tz_rule.parse_tz_rule("<+0330>-3:30<+0430>,J79/24,J263/24")
assert rule.std.name == "<+0330>"
assert rule.std.offset == datetime.timedelta(hours=3, minutes=30)
assert rule.dst
assert rule.dst.name == "<+0430>"
assert rule.dst.offset == datetime.timedelta(hours=4, minutes=30)
assert rule.dst_start
assert isinstance(rule.dst_start, tz_rule.RuleDay)
assert rule.dst_start.day_of_year == 79
assert rule.dst_start.time == datetime.timedelta(hours=24)
assert rule.dst_end
assert isinstance(rule.dst_end, tz_rule.RuleDay)
assert rule.dst_end.day_of_year == 263
assert rule.dst_end.time == datetime.timedelta(hours=24)
def test_parse_tz_rule_benchmark(benchmark: Any) -> None:
"""Benchmark to measure the speed of parsing."""
def parse() -> None:
tz_rule.parse_tz_rule("EST5")
tz_rule.parse_tz_rule("EST+5EDT,M3.2.0,M11.1.0")
tz_rule.parse_tz_rule("<-03>3<-02>,M3.5.0/-2,M10.5.0/-1")
benchmark(parse)
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