`timescale 1ns/1ps
module buttontoled_tb(input i_sw, output o_led);
    buttontoled UUT (.i_sw(ai_sw), .o_led(o_led));
    always@(i_sw)// i would asume this is always statment is correct?
    begin
        i_sw = ~i_sw;
        #10;
    end

 endmodule