"""Guard against circular imports (e.g. api.client ↔ core.device_manager)."""

from __future__ import annotations

import importlib


def test_mass_config_page_imports_cleanly() -> None:
    """Importing the Mass Config page must not hit partially initialized api.client."""
    importlib.import_module("shelly_manager.ui.pages.3_Mass_Config")


def test_core_package_lazy_device_manager() -> None:
    """DeviceManager is available via lazy attribute without eager import cycle."""
    import shelly_manager.core as core

    assert core.DeviceManager is not None