'Test encrypted payload with no key, .'

@patch('homeassistant.components.device_tracker.owntracks.get_cipher', mock_cipher)
def test_encrypted_payload_no_key(self):

    with assert_setup_component(1, device_tracker.DOMAIN):
        assert setup_component(self.hass, device_tracker.DOMAIN, {device_tracker.DOMAIN: {CONF_PLATFORM: 'owntracks'}})
    self.send_message(LOCATION_TOPIC, MOCK_ENCRYPTED_LOCATION_MESSAGE)
    self.assert_location_latitude(None)
