Add significant change support to lock (#45726)

tests/components/lock/test_significant_change.py

@@ -0,0 +1,23 @@
+"""Test the Lock significant change platform."""
+from homeassistant.components.lock.significant_change import (
+    async_check_significant_change,
+)
+
+
+async def test_significant_change():
+    """Detect Lock significant changes."""
+    old_attrs = {"attr_1": "a"}
+    new_attrs = {"attr_1": "b"}
+
+    assert (
+        async_check_significant_change(None, "locked", old_attrs, "locked", old_attrs)
+        is False
+    )
+    assert (
+        async_check_significant_change(None, "locked", old_attrs, "locked", new_attrs)
+        is False
+    )
+    assert (
+        async_check_significant_change(None, "locked", old_attrs, "unlocked", old_attrs)
+        is True
+    )