Add shutdown test. (#55357)

tests/components/modbus/test_init.py

@@ -79,6 +79,7 @@ from homeassistant.const import (
     CONF_STRUCTURE,
     CONF_TIMEOUT,
     CONF_TYPE,
+    EVENT_HOMEASSISTANT_STOP,
     STATE_ON,
     STATE_UNAVAILABLE,
 )
@@ -686,3 +687,29 @@ async def test_delay(hass, mock_pymodbus):
         async_fire_time_changed(hass, now)
         await hass.async_block_till_done()
         assert hass.states.get(entity_id).state == STATE_ON
+
+
+@pytest.mark.parametrize(
+    "do_config",
+    [
+        {
+            CONF_TYPE: TCP,
+            CONF_HOST: TEST_MODBUS_HOST,
+            CONF_PORT: TEST_PORT_TCP,
+            CONF_SENSORS: [
+                {
+                    CONF_NAME: TEST_ENTITY_NAME,
+                    CONF_ADDRESS: 117,
+                    CONF_SCAN_INTERVAL: 0,
+                }
+            ],
+        },
+    ],
+)
+async def test_shutdown(hass, caplog, mock_pymodbus, mock_modbus_with_pymodbus):
+    """Run test for shutdown."""
+    hass.bus.async_fire(EVENT_HOMEASSISTANT_STOP)
+    await hass.async_block_till_done()
+    await hass.async_block_till_done()
+    assert mock_pymodbus.close.called
+    assert caplog.text == ""