def is_valid_schedule(schedule: Schedule) -> bool:
    """Check schedule with enhanced type validations."""
    # Ensure schedule is an instance of Schedule.
    if not isinstance(schedule, Schedule):
        return False

    # Optionally, validate that schedule has a non-empty "name" attribute.
    if not hasattr(schedule, "name") or not schedule.name:
        return False

    # Optionally, validate that schedule has a "json" attribute that is a dict.
    if not hasattr(schedule, "json") or not isinstance(schedule.json, dict):
        return False

    return True

import json
import pytest
from unittest.mock import AsyncMock, patch
# Assuming that MockResponse and async_home are available in this file or imported from the appropriate location.

@pytest.mark.asyncio
async def test_async_set_schedule_temperatures_unsuccessful_response():
    temps = {"2746182631": 15}
    # Load fixture file
    with open("fixtures/sync_schedule_591b54a2764ff4d50d8b5795.json", encoding="utf-8") as fixture_file:
        json_fixture = json.load(fixture_file)

    # Simulate a non-200 response (e.g., 500 error)
    with patch(
        "pyatmo.auth.AbstractAsyncAuth.async_post_api_request",
        AsyncMock(return_value=MockResponse({"status": "error"}, 500)),
    ) as mock_resp:
        # Depending on implementation, the function might raise an exception or handle the error internally.
        # Here we assume it will raise an exception.
        with pytest.raises(Exception):
            await async_home.async_set_schedule_temperatures(1, temps)

        mock_resp.assert_awaited()

@pytest.mark.asyncio
async def test_async_set_schedule_temperatures_exception():
    temps = {"2746182631": 15}
    with open("fixtures/sync_schedule_591b54a2764ff4d50d8b5795.json", encoding="utf-8") as fixture_file:
        json_fixture = json.load(fixture_file)

    # Simulate an exception being raised by the API call.
    with patch(
        "pyatmo.auth.AbstractAsyncAuth.async_post_api_request",
        AsyncMock(side_effect=Exception("API failure")),
    ) as mock_resp:
        with pytest.raises(Exception):
            await async_home.async_set_schedule_temperatures(1, temps)

        mock_resp.assert_awaited()

@pytest.mark.asyncio()

async def test_async_sync_schedule_invalid_schedule(async_home):

import pytest

@pytest.mark.asyncio()
@pytest.mark.parametrize("invalid_schedule", [
    {"invalid": "data"},  # generic invalid schedule
    {},  # missing keys
    {"start_time": "not_a_timestamp", "end_time": "not_a_timestamp"},  # incorrect data types
    {"start_time": None, "end_time": "2020-01-01T00:00:00Z"},  # invalid start_time value
    {"start_time": "2020-01-01T00:00:00Z", "end_time": -5},  # end_time as invalid numeric value
])
async def test_async_sync_schedule_invalid_schedule(async_home, invalid_schedule):
    """Test syncing various invalid schedules."""