module tb;
    logic clk = 0, rst = 1, jump = 0, branch_taken = 0;
    logic [31:0] target = 0, pc;
    logic [31:0] expected [0:6] = '{32'h0,32'h4,32'h8,32'h20,32'h24,32'h10,32'h14};
    string trace_file;
    program_counter dut (.*);
    always #1 clk = ~clk;
    task automatic tick_and_check(input integer index);
        @(posedge clk); #1;
        if (pc !== expected[index]) $fatal(1, "FAIL index=%0d pc=%h expected=%h", index, pc, expected[index]);
    endtask
    initial begin
        if ($value$plusargs("trace=%s", trace_file)) begin $dumpfile(trace_file); $dumpvars(0, tb); end
        tick_and_check(0); @(negedge clk); rst = 0;
        tick_and_check(1); tick_and_check(2);
        @(negedge clk); branch_taken = 1; target = 32'h20; tick_and_check(3);
        @(negedge clk); branch_taken = 0; tick_and_check(4);
        @(negedge clk); jump = 1; target = 32'h10; tick_and_check(5);
        @(negedge clk); jump = 0; tick_and_check(6);
        $display("PASS task03 pc=00000000,00000004,00000008,00000020,00000024,00000010,00000014 branches=1 jumps=1");
        $finish;
    end
endmodule