text: """The tests for the tube_state platform."""
  import unittest
  import requests_mock
  
  from homeassistant.components.sensor.london_air import (
      CONF_LOCATIONS, URL)
  from homeassistant.setup import setup_component
  from tests.common import load_fixture, get_test_home_assistant
  
  VALID_CONFIG = {
      'platform': 'london_air',
      CONF_LOCATIONS: [
          'Merton',
      ]
  }
  
  
  class TestLondonAirSensor(unittest.TestCase):
      """Test the tube_state platform."""
  
      def setUp(self):
          """Initialize values for this testcase class."""
          self.hass = get_test_home_assistant()
          self.config = VALID_CONFIG
  
      def tearDown(self):
          """Stop everything that was started."""
          self.hass.stop()
  
      @requests_mock.Mocker()
      def test_setup(self, mock_req):
          """Test for operational tube_state sensor with proper attributes."""
          mock_req.get(URL, text=load_fixture('london_air.json'))
          self.assertTrue(
              setup_component(self.hass, 'sensor', {'sensor': self.config}))
  
          state = self.hass.states.get('sensor.merton')
          assert state.state == 'Low'
          assert state.attributes.get('updated') == '2017-08-03 03:00:00'
          assert state.attributes.get('sites') == 2
          assert state.attributes.get('data')[0]['site_code'] == 'ME2'
  