"""HomeKit controller session fixtures."""
import datetime
from unittest import mock

import pytest


@pytest.fixture
def utcnow(request):
    """Freeze time at a known point."""
    start_dt = datetime.datetime(2019, 1, 1, 0, 0, 0)
    with mock.patch("homeassistant.util.dt.utcnow") as dt_utcnow:
        dt_utcnow.return_value = start_dt
        yield dt_utcnow
