`timescale 1 ns / 10 ps

module collatz_tb ();
  reg clk = 0;
  reg rst = 0;

  wire finish;

  localparam integer DURATION = 10_000;

  always begin
    #41.667;

    clk = ~ clk;
  end

  reg [15:0] n = 9;
  reg start_int;

  wire [15:0] count_out;

  collatz ctz (
    .clk(clk),
    .rst(rst),
    .in_start(n),
    .start_int(start_int),
    .o_count(count_out),
    .finish_int(finish)
  );

  initial begin
    #10 rst = 1'b1;
    #1 rst = 1'b0;
  end

  initial begin
    $dumpfile("collatz_tb.vcd");
    $dumpvars(0, collatz_tb);

    #50 start_int = 1;
    #10 start_int = 0;

    #(DURATION);
    $display("Finished!");
    $finish;
  end

endmodule