from __future__ import annotations
import pytest
from src.hot_reloader import HotModule, HotReloader

def test_hot_module_dataclass_fields():
    hm = HotModule(
        name="test_module",
        file_path="/path/to/test_module.py",
        state_keys=["attr1", "attr2"],
        delegation_targets=["method_a", "method_b"],
    )
    assert hm.name == "test_module"
    assert hm.file_path == "/path/to/test_module.py"
    assert hm.state_keys == ["attr1", "attr2"]
    assert hm.delegation_targets == ["method_a", "method_b"]

def test_hot_reloader_register_and_get():
    HotReloader.HOT_MODULES.clear()
    hm = HotModule(name="test_mod", file_path="/fake/path.py", state_keys=[], delegation_targets=[])
    HotReloader.register(hm)
    assert "test_mod" in HotReloader.HOT_MODULES
    assert HotReloader.HOT_MODULES["test_mod"] is hm

def test_hot_reloader_register_duplicate_raises():
    HotReloader.HOT_MODULES.clear()
    hm1 = HotModule(name="dup", file_path="/a.py", state_keys=[], delegation_targets=[])
    HotReloader.register(hm1)
    with pytest.raises(ValueError, match="already registered"):
        HotReloader.register(hm1)

def test_hot_reloader_is_error_state():
    HotReloader.HOT_MODULES.clear()
    HotReloader.last_error = None
    HotReloader.is_error_state = False
    assert HotReloader.is_error_state is False