'Setup demo platform with wrong get_tts_audio.'

@patch('homeassistant.components.tts.demo.DemoProvider.get_tts_audio', return_value=(None, None))
def test_setup_component_test_with_error_on_get_tts(self, tts_mock):

    calls = mock_service(self.hass, DOMAIN_MP, SERVICE_PLAY_MEDIA)
    config = {tts.DOMAIN: {'platform': 'demo'}}
    with assert_setup_component(1, tts.DOMAIN):
        setup_component(self.hass, tts.DOMAIN, config)
    self.hass.services.call(tts.DOMAIN, 'demo_say', {tts.ATTR_MESSAGE: 'I    person    is    on    front    of    your    door.'})
    self.hass.block_till_done()
    assert (len(calls) == 0)
