'Test not creating Cast Group when not discovered.'

@patch('homeassistant.components.media_player.cast.CastDevice')
@patch('pychromecast.get_chromecasts')
@patch('pychromecast.Chromecast')
def test_fallback_cast_group(self, mock_chromecast, mock_get_chromecasts, mock_device):

    mock_get_chromecasts.return_value = [FakeChromeCast('some_host', cast.DEFAULT_PORT)]
    cast.setup_platform(self.hass, {}, (lambda _: _), {'host': 'some_other_host', 'port': 43546})
    assert (not mock_chromecast.called)
    assert (not mock_device.called)
