feat(q7): add set_child_lock trait method

roborock/devices/traits/b01/q7/__init__.py

@@ -112,6 +112,10 @@ async def set_volume(self, volume: int) -> None:
         """Set the robot voice volume (0-100)."""
         await self.set_prop(RoborockB01Props.VOLUME, volume)
 
+    async def set_child_lock(self, enabled: bool) -> None:
+        """Enable or disable the child lock."""
+        await self.set_prop(RoborockB01Props.CHILD_LOCK, int(enabled))
+
     async def start_clean(self) -> None:
         """Start cleaning."""
         await self.send(

tests/devices/traits/b01/q7/test_init.py

@@ -170,6 +170,28 @@ async def test_q7_api_set_volume(
     assert payload_data["dps"]["10000"]["params"] == {RoborockB01Props.VOLUME: volume}
 
 
+@pytest.mark.parametrize(
+    ("enabled", "expected_code"),
+    [(True, 1), (False, 0)],
+)
+async def test_q7_api_set_child_lock(
+    enabled: bool,
+    expected_code: int,
+    q7_api: Q7PropertiesApi,
+    fake_channel: FakeChannel,
+    message_builder: B01MessageBuilder,
+):
+    """Test toggling the child lock."""
+    fake_channel.response_queue.append(message_builder.build({"result": "ok"}))
+    await q7_api.set_child_lock(enabled)
+
+    assert len(fake_channel.published_messages) == 1
+    message = fake_channel.published_messages[0]
+    payload_data = json.loads(unpad(message.payload, AES.block_size))
+    assert payload_data["dps"]["10000"]["method"] == "prop.set"
+    assert payload_data["dps"]["10000"]["params"] == {RoborockB01Props.CHILD_LOCK: expected_code}
+
+
 @pytest.mark.parametrize(
     ("mode", "expected_code"),
     [