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backend/tests/test_recurrence.py
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296
backend/tests/test_recurrence.py
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"""Тесты recurrence-ядра (ADR-001, п.3): `RecurrenceRule` и `expand_occurrences`.
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Пишутся ДО реализации `services/recurrence.py` (TDD). Покрывают все 4 типа
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повторения, клэмп 31-го числа, переход года, пустой диапазон, включительность
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границ диапазона и корректность конвертации локального времени в UTC.
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"""
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from datetime import UTC, datetime, timedelta
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import pytest
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from pydantic import ValidationError
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from services.recurrence import RecurrenceRule, expand_occurrences
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def _rule(**overrides: object) -> RecurrenceRule:
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"""Собрать валидное правило с разумными умолчаниями, переопределяя нужные поля."""
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defaults: dict[str, object] = {
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"type": "weekly",
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"weekdays": [0],
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"anchor_date": datetime(2026, 1, 5).date(), # понедельник
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"time_local": "10:00",
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"timezone": "UTC",
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"duration_minutes": 60,
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}
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defaults.update(overrides)
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return RecurrenceRule.model_validate(defaults)
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class TestRecurrenceRuleValidation:
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"""Валидация Pydantic-модели правила."""
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def test_weekly_requires_weekdays(self) -> None:
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with pytest.raises(ValidationError):
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_rule(type="weekly", weekdays=[])
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def test_monthly_requires_day_of_month(self) -> None:
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with pytest.raises(ValidationError):
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_rule(type="monthly", day_of_month=None)
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def test_every_n_days_requires_interval_days(self) -> None:
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with pytest.raises(ValidationError):
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_rule(type="every_n_days", interval_days=None)
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def test_weekday_out_of_range_rejected(self) -> None:
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with pytest.raises(ValidationError):
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_rule(weekdays=[7])
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def test_day_of_month_out_of_range_rejected(self) -> None:
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with pytest.raises(ValidationError):
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_rule(type="monthly", day_of_month=32)
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def test_interval_days_must_be_positive(self) -> None:
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with pytest.raises(ValidationError):
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_rule(type="every_n_days", interval_days=0)
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def test_invalid_time_format_rejected(self) -> None:
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with pytest.raises(ValidationError):
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_rule(time_local="25:99")
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def test_invalid_timezone_rejected(self) -> None:
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with pytest.raises(ValidationError):
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_rule(timezone="Not/AZone")
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class TestExpandOccurrencesWeekly:
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"""type='weekly': вхождение на каждой указанной неделе для всех weekdays."""
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def test_multiple_weekdays_in_one_week(self) -> None:
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# Пн(0)/Ср(2)/Пт(4), 10:00 UTC, неделя с 2026-01-05 (пн) по 2026-01-11 (вс)
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rule = _rule(type="weekly", weekdays=[0, 2, 4])
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 5, tzinfo=UTC),
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datetime(2026, 1, 11, 23, 59, tzinfo=UTC),
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)
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assert occurrences == [
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datetime(2026, 1, 5, 10, 0, tzinfo=UTC),
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datetime(2026, 1, 7, 10, 0, tzinfo=UTC),
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datetime(2026, 1, 9, 10, 0, tzinfo=UTC),
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]
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def test_repeats_every_week(self) -> None:
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rule = _rule(type="weekly", weekdays=[0])
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 1, 31, tzinfo=UTC),
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)
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# Понедельники января 2026: 5, 12, 19, 26
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assert [d.day for d in occurrences] == [5, 12, 19, 26]
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assert all(d.hour == 10 for d in occurrences)
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class TestExpandOccurrencesBiweekly:
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"""type='biweekly': чётность недель считается от `anchor_date`."""
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def test_every_other_week_from_anchor(self) -> None:
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# anchor 2026-01-05 (пн) — неделя-0 включена, неделя-1 (12-е) исключена,
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# неделя-2 (19-е) включена и т.д.
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rule = _rule(type="biweekly", weekdays=[0], anchor_date=datetime(2026, 1, 5).date())
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 2, 28, tzinfo=UTC),
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)
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assert [d.day for d in occurrences[:3]] == [5, 19, 2] # 2 февраля
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def test_anchor_not_matching_weekday_still_defines_parity(self) -> None:
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# anchor в среду той же недели, что и понедельник 2026-01-05 —
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# чётность определяется по началу недели anchor, а не по его weekday.
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rule = _rule(type="biweekly", weekdays=[0], anchor_date=datetime(2026, 1, 7).date())
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 1, 31, tzinfo=UTC),
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)
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assert [d.day for d in occurrences] == [5, 19]
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class TestExpandOccurrencesMonthly:
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"""type='monthly': day_of_month=31 клэмпится к последнему дню короткого месяца."""
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def test_31_clamped_in_short_months(self) -> None:
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rule = _rule(type="monthly", weekdays=[], day_of_month=31)
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 4, 30, 23, 59, tzinfo=UTC),
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)
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# 2026 — невисокосный год: январь(31), февраль(28), март(31), апрель(30)
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assert [(d.month, d.day) for d in occurrences] == [
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(1, 31),
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(2, 28),
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(3, 31),
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(4, 30),
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]
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def test_31_clamped_to_29_in_leap_february(self) -> None:
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rule = _rule(type="monthly", weekdays=[], day_of_month=31)
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occurrences = expand_occurrences(
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rule,
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datetime(2024, 2, 1, tzinfo=UTC),
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datetime(2024, 2, 29, 23, 59, tzinfo=UTC),
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)
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assert [(d.month, d.day) for d in occurrences] == [(2, 29)]
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def test_regular_day_of_month(self) -> None:
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rule = _rule(type="monthly", weekdays=[], day_of_month=15)
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 3, 31, tzinfo=UTC),
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)
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assert [d.day for d in occurrences] == [15, 15, 15]
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class TestExpandOccurrencesEveryNDays:
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"""type='every_n_days': шаг фиксированного числа дней от `anchor_date`."""
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def test_step_of_five_days(self) -> None:
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rule = _rule(
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type="every_n_days",
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weekdays=[],
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interval_days=5,
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anchor_date=datetime(2026, 1, 1).date(),
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)
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 1, 20, tzinfo=UTC),
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)
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assert [d.day for d in occurrences] == [1, 6, 11, 16]
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def test_before_anchor_no_occurrences(self) -> None:
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rule = _rule(
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type="every_n_days",
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weekdays=[],
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interval_days=3,
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anchor_date=datetime(2026, 1, 10).date(),
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)
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 1, 9, 23, 59, tzinfo=UTC),
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)
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assert occurrences == []
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class TestYearTransition:
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"""Развёртка не должна ломаться на переходе декабрь -> январь."""
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def test_weekly_across_year_boundary(self) -> None:
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rule = _rule(type="weekly", weekdays=[3]) # четверг
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occurrences = expand_occurrences(
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rule,
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datetime(2025, 12, 25, tzinfo=UTC),
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datetime(2026, 1, 8, 23, 59, tzinfo=UTC),
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)
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assert [(d.year, d.month, d.day) for d in occurrences] == [
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(2025, 12, 25),
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(2026, 1, 1),
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(2026, 1, 8),
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]
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def test_every_n_days_across_year_boundary(self) -> None:
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rule = _rule(
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type="every_n_days",
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weekdays=[],
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interval_days=10,
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anchor_date=datetime(2025, 12, 20).date(),
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)
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occurrences = expand_occurrences(
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rule,
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datetime(2025, 12, 20, tzinfo=UTC),
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datetime(2026, 1, 10, tzinfo=UTC),
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)
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assert [(d.year, d.month, d.day) for d in occurrences] == [
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(2025, 12, 20),
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(2025, 12, 30),
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(2026, 1, 9),
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]
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class TestRangeEdgeCases:
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"""Пустой диапазон и включительность границ."""
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def test_empty_range_when_from_after_to(self) -> None:
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rule = _rule(type="weekly", weekdays=[0, 1, 2, 3, 4, 5, 6])
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 10, tzinfo=UTC),
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datetime(2026, 1, 1, tzinfo=UTC),
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)
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assert occurrences == []
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def test_boundaries_are_inclusive(self) -> None:
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# Вхождение ровно в момент t_from и ровно в момент t_to должно попасть
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# в результат (обе границы включительны).
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rule = _rule(type="weekly", weekdays=[0], time_local="10:00", timezone="UTC")
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t_from = datetime(2026, 1, 5, 10, 0, tzinfo=UTC)
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t_to = datetime(2026, 1, 12, 10, 0, tzinfo=UTC)
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occurrences = expand_occurrences(rule, t_from, t_to)
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assert occurrences[0] == t_from
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assert occurrences[-1] == t_to
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def test_one_minute_outside_boundaries_excluded(self) -> None:
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rule = _rule(type="weekly", weekdays=[0], time_local="10:00", timezone="UTC")
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t_from = datetime(2026, 1, 5, 10, 1, tzinfo=UTC)
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t_to = datetime(2026, 1, 12, 9, 59, tzinfo=UTC)
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occurrences = expand_occurrences(rule, t_from, t_to)
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assert occurrences == []
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class TestTimezoneOffset:
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"""Правило хранит локальное время + IANA tz; развёртка возвращает aware UTC."""
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def test_local_time_converted_to_utc(self) -> None:
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# Europe/Moscow — постоянное смещение UTC+3 без перехода на летнее время.
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rule = _rule(
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type="weekly",
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weekdays=[0],
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time_local="10:00",
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timezone="Europe/Moscow",
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)
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 5, tzinfo=UTC),
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datetime(2026, 1, 5, 23, 59, tzinfo=UTC),
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)
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assert occurrences == [datetime(2026, 1, 5, 7, 0, tzinfo=UTC)]
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def test_negative_offset_timezone(self) -> None:
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# America/New_York в начале января — зимнее время, UTC-5.
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rule = _rule(
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type="weekly",
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weekdays=[0],
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time_local="09:00",
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timezone="America/New_York",
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)
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 5, tzinfo=UTC),
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datetime(2026, 1, 5, 23, 59, tzinfo=UTC),
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)
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assert occurrences == [datetime(2026, 1, 5, 14, 0, tzinfo=UTC)]
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def test_result_timestamps_are_utc_aware(self) -> None:
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rule = _rule(type="weekly", weekdays=[0], timezone="Europe/Moscow")
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occurrences = expand_occurrences(
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rule,
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datetime(2026, 1, 1, tzinfo=UTC),
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datetime(2026, 1, 31, tzinfo=UTC),
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)
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assert occurrences
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assert all(d.tzinfo is not None and d.utcoffset() == timedelta(0) for d in occurrences)
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