"""Unit tests for the plugin_metrics rollup cutoff helpers (no DB)."""
from datetime import datetime, timezone

from steward.core.metrics_retention import _hour_floor, _rollup_cutoff


def test_hour_floor_drops_sub_hour():
    dt = datetime(2026, 6, 20, 15, 42, 9, 123456, tzinfo=timezone.utc)
    assert _hour_floor(dt) == datetime(2026, 6, 20, 15, 0, 0, 0, tzinfo=timezone.utc)


def test_rollup_cutoff_is_hour_aligned_and_offset():
    now = datetime(2026, 6, 20, 15, 42, 9, tzinfo=timezone.utc)
    cutoff = _rollup_cutoff(now, 7)
    assert (cutoff.minute, cutoff.second, cutoff.microsecond) == (0, 0, 0)
    # 7 whole days back, then floored to the hour.
    assert cutoff == datetime(2026, 6, 13, 15, 0, 0, 0, tzinfo=timezone.utc)