text: """The tests for the  MQTT binary sensor platform."""
  import unittest
  
  from homeassistant.bootstrap import setup_component
  import homeassistant.components.binary_sensor as binary_sensor
  from tests.common import mock_mqtt_component, fire_mqtt_message
  from homeassistant.const import (STATE_OFF, STATE_ON)
  
  from tests.common import get_test_home_assistant
  
  
  class TestSensorMQTT(unittest.TestCase):
      """Test the MQTT sensor."""
  
      def setUp(self):  # pylint: disable=invalid-name
          """Setup things to be run when tests are started."""
          self.hass = get_test_home_assistant()
          mock_mqtt_component(self.hass)
  
      def tearDown(self):  # pylint: disable=invalid-name
          """Stop everything that was started."""
          self.hass.stop()
  
      def test_setting_sensor_value_via_mqtt_message(self):
          """Test the setting of the value via MQTT."""
          self.hass.config.components = ['mqtt']
          assert setup_component(self.hass, binary_sensor.DOMAIN, {
              binary_sensor.DOMAIN: {
                  'platform': 'mqtt',
                  'name': 'test',
                  'state_topic': 'test-topic',
                  'payload_on': 'ON',
                  'payload_off': 'OFF',
              }
          })
  
          state = self.hass.states.get('binary_sensor.test')
          self.assertEqual(STATE_OFF, state.state)
  
          fire_mqtt_message(self.hass, 'test-topic', 'ON')
          self.hass.block_till_done()
          state = self.hass.states.get('binary_sensor.test')
          self.assertEqual(STATE_ON, state.state)
  
          fire_mqtt_message(self.hass, 'test-topic', 'OFF')
          self.hass.block_till_done()
          state = self.hass.states.get('binary_sensor.test')
          self.assertEqual(STATE_OFF, state.state)
  
      def test_valid_sensor_class(self):
          """Test the setting of a valid sensor class."""
          self.hass.config.components = ['mqtt']
          assert setup_component(self.hass, binary_sensor.DOMAIN, {
              binary_sensor.DOMAIN: {
                  'platform': 'mqtt',
                  'name': 'test',
                  'sensor_class': 'motion',
                  'state_topic': 'test-topic',
              }
          })
  
          state = self.hass.states.get('binary_sensor.test')
          self.assertEqual('motion', state.attributes.get('sensor_class'))
  
      def test_invalid_sensor_class(self):
          """Test the setting of an invalid sensor class."""
          self.hass.config.components = ['mqtt']
          assert setup_component(self.hass, binary_sensor.DOMAIN, {
              binary_sensor.DOMAIN: {
                  'platform': 'mqtt',
                  'name': 'test',
                  'sensor_class': 'abc123',
                  'state_topic': 'test-topic',
              }
          })
  
          state = self.hass.states.get('binary_sensor.test')
          self.assertIsNone(state.attributes.get('sensor_class'))
  