/****
 * seconds_display_tb.sv - testbench for the seconds_display module.
 *
 * @author: Waylon Cude, Dilanthi Prentice
 * @date: 6/12/2025
 *
 * */

`timescale 1ns / 1ps
module seconds_display_tb;
int errors = 0;
logic [5:0] seconds;
wire [6:0] display_tens;
wire [6:0] display_ones;

logic [6:0] expected_tens;
logic [6:0] expected_ones;

sixty_display Dut(.number(seconds),.*);
initial begin
    $display("Testing seconds_display");
    for (seconds=0; seconds<60; seconds++) begin
        expected_ones = encode_number(seconds % 10);
        expected_tens = encode_number(seconds /10);
        #1
        if (display_ones !== expected_ones) begin
            errors++;
            $error("Failed ones test case, seconds = %d, displayed = %b, expected = %b",
                     seconds,
                     display_ones,
                     expected_ones);
        end
        else
        if (display_tens !== expected_tens) begin
            errors++;
            $error("Failed tens test case, seconds = %d, displayed = %b, expected = %b",
                     seconds,
                     display_tens,
                     expected_tens);
        end
    end

    if (errors == 0)
        $display("All tests passing");
end

endmodule

function automatic logic [6:0] encode_number(logic [5:0] num);
    case (num)
        0: return 7'b1111110;
        1: return 7'b0000110;
        2: return 7'b1101101;
        3: return 7'b1111001;
        4: return 7'b0110011;
        5: return 7'b1011011;
        6: return 7'b1011111;
        7: return 7'b1110000;
        8: return 7'b1111111;
        9: return 7'b1111011;
    endcase
endfunction