'Setup the demo platform with defaults.'

def test_setup_component_demo(self):

    config = {tts.DOMAIN: {'platform': 'demo'}}
    with assert_setup_component(1, tts.DOMAIN):
        setup_component(self.hass, tts.DOMAIN, config)
    assert self.hass.services.has_service(tts.DOMAIN, 'demo_say')
    assert self.hass.services.has_service(tts.DOMAIN, 'clear_cache')
