Fix london_underground issue (#19642)

* Update london_underground.py

* Update test

* Update london_underground.py

* Update london_underground.py

* Update london_underground.py

* Fix lint

* Use london-tube-status==0.2

tests/components/sensor/test_london_underground.py

@@ -1,37 +0,0 @@
-"""The tests for the tube_state platform."""
-import unittest
-import requests_mock
-
-from homeassistant.components.sensor.london_underground import CONF_LINE, URL
-from homeassistant.setup import setup_component
-from tests.common import load_fixture, get_test_home_assistant
-
-VALID_CONFIG = {
-    'platform': 'london_underground',
-    CONF_LINE: [
-        'London Overground',
-    ]
-}
-
-
-class TestLondonTubeSensor(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_underground.json'))
-        assert setup_component(self.hass, 'sensor', {'sensor': self.config})
-
-        state = self.hass.states.get('sensor.london_overground')
-        assert state.state == 'Minor Delays'
-        assert state.attributes.get('Description') == 'something'