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`timescale 1 ns / 100 ps
module alu_tb ();
reg [3:0] op;
reg [15:0] x;
reg [15:0] y;
wire [15:0] result;
reg [15:0] expected_result;
wire zero;
reg expected_zero;
wire carry;
reg expected_carry;
initial begin
x = 16'h0123;
y = 16'h1234;
op = 4'h0; // add
expected_result = 16'h1357;
expected_zero = 1'b0;
expected_carry = 1'b0;
#2
op = 4'h1; // subtract
expected_result = 16'hEEEF;
expected_carry = 1'b1;
expected_zero = 1'b0;
#2
y = 16'h0123;
expected_result = 16'h0;
expected_zero = 1'b1;
expected_carry = 1'b0;
#2
y = 16'h1234;
op = 4'h2; // multiply
expected_result = 16'hB11C;
expected_zero = 1'b0;
expected_carry = 1'b0;
#2
x = 16'h3E58;
y = 16'h0078;
op = 4'h3; // divide
expected_result = 16'h0085;
#2
x = 16'hAF74;
y = 16'h7CC7;
op = 4'h4; // and
expected_result = 16'h2C44;
#2
op = 4'h5; // or
expected_result = 16'hFFF7;
#2
op = 4'h6; // xor
expected_result = 16'hD3B3;
#5
$stop;
end
alu alu_inst (
.op(op),
.x(x),
.y(y),
.result(result),
.zero(zero),
.carry(carry)
);
endmodule
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