add sys.flag.interactive test
add sys.flag.interactive test

drufat/vispy,ghisvail/vispy,Eric89GXL/vispy,Eric89GXL/vispy,michaelaye/vispy,drufat/vispy,ghisvail/vispy,michaelaye/vispy,ghisvail/vispy,drufat/vispy,michaelaye/vispy,Eric89GXL/vispy