Implement person significant change (#45713)

homeassistant/components/person/significant_change.py

@@ -0,0 +1,21 @@
+"""Helper to test significant Person state changes."""
+from typing import Any, Optional
+
+from homeassistant.core import HomeAssistant, callback
+
+
+@callback
+def async_check_significant_change(
+    hass: HomeAssistant,
+    old_state: str,
+    old_attrs: dict,
+    new_state: str,
+    new_attrs: dict,
+    **kwargs: Any,
+) -> Optional[bool]:
+    """Test if state significantly changed."""
+
+    if new_state != old_state:
+        return True
+
+    return False

tests/components/person/test_significant_change.py

@@ -0,0 +1,16 @@
+"""Test the Person significant change platform."""
+from homeassistant.components.person.significant_change import (
+    async_check_significant_change,
+)
+
+
+async def test_significant_change():
+    """Detect Person significant changes and ensure that attribute changes do not trigger a significant change."""
+    old_attrs = {"source": "device_tracker.wifi_device"}
+    new_attrs = {"source": "device_tracker.gps_device"}
+    assert not async_check_significant_change(
+        None, "home", old_attrs, "home", new_attrs
+    )
+    assert async_check_significant_change(
+        None, "home", new_attrs, "not_home", new_attrs
+    )