`timescale 1us/1us

`include "nandgame_types.v"

module  arith_unit_tb;

logic [15:0] tst_in1;
logic [15:0] tst_in2;
ArithCode tst_opcode;
logic [15:0] tst_result;

 arith_unit uut (
  .X_in(tst_in1),
  .Y_in(tst_in2),
  .arith_operation_in(tst_opcode),
  .result_out(tst_result)
);

string filename;
initial begin
`ifdef DUMP_FILE_NAME
  filename=`DUMP_FILE_NAME;
`else
  filename=" arith_unit.lxt2";
`endif
  $dumpfile(filename); $dumpvars();

end

initial begin
  tst_in1 = 13;
  tst_in2 = 17;
  tst_opcode = ARITH_PLUS;
  #1
  assert(tst_result == 30);
  #1
  tst_in1 = 12;
  tst_in2 = 4;
  tst_opcode = ARITH_MINUS;
  #1
  assert(tst_result == 8);
  #1
  tst_in1 = 12;
  tst_in2 = 13;
  tst_opcode = ARITH_MINUS;
  #1
  assert(tst_result == 16'hffff);
  #1
  tst_in1 = 13;
  tst_in2 = 17;
  tst_opcode = ARITH_INC;
  #1
  assert(tst_result == 14);
  #1
  tst_in1 = 13;
  tst_in2 = 17;
  tst_opcode = ARITH_DEC;
  #1
  assert(tst_result == 12);
  #1
  tst_in1 = 0;
  tst_in2 = 17;
  tst_opcode = ARITH_DEC;
  #1
  assert(tst_result == 16'hffff);
  #1
  $finish();
end

endmodule