async def async_setup_platform(hass, config, async_add_devices_callback, discovery_info=None):
    'Find and return test switches.'
    async_add_devices_callback(DEVICES)
Find and return test switches.
async def async_setup_platform(hass, config, async_add_devices_callback, discovery_info=None):
    
    async_add_devices_callback(DEVICES)