Config validation for MQTT

tests/common.py

@@ -4,6 +4,7 @@ from datetime import timedelta
 from unittest import mock
 
 from homeassistant import core as ha, loader
+from homeassistant.bootstrap import _setup_component
 from homeassistant.helpers.entity import ToggleEntity
 from homeassistant.const import (
     STATE_ON, STATE_OFF, DEVICE_DEFAULT_NAME, EVENT_TIME_CHANGED,
@@ -123,7 +124,7 @@ def mock_http_component(hass):
 @mock.patch('homeassistant.components.mqtt.MQTT')
 def mock_mqtt_component(hass, mock_mqtt):
     """Mock the MQTT component."""
-    mqtt.setup(hass, {
+    _setup_component(hass, mqtt.DOMAIN, {
         mqtt.DOMAIN: {
             mqtt.CONF_BROKER: 'mock-broker',
         }