from datetime import datetime
from zoneinfo import ZoneInfo

from app.periods import day_bounds, month_bounds


def test_month_bounds_in_december():
    now = datetime(2026, 12, 15, 10, tzinfo=ZoneInfo("UTC"))
    start, end = month_bounds(now)
    assert start == datetime(2026, 12, 1, tzinfo=ZoneInfo("UTC"))
    assert end == datetime(2027, 1, 1, tzinfo=ZoneInfo("UTC"))


def test_day_bounds():
    now = datetime(2026, 7, 13, 22, 10, tzinfo=ZoneInfo("UTC"))
    start, end = day_bounds(now)
    assert start.day == 13
    assert end.day == 14