Priority Encoder Testbench

module priority_tst();
    reg [3:0] W;
    wire [1:0] Y;
    wire Z;
    priority uut ( W, Y, Z);
        initial begin
            W = 4'b0001;
        #10 W = 4'b0010;
        #10 W = 4'b0011;
        #10 W = 4'b0100;
        #10 W = 4'b0101;
        #10 W = 4'b0110;
        #10 W = 4'b0111;
        #10 W = 4'b1000;
        #10 W = 4'b1001;
        #10 W = 4'b1010;
        #10 W = 4'b1011;
        #10 W = 4'b1100;
        #10 W = 4'b1101;
        #10 W = 4'b1110;
        #10 W = 4'b1111;
        end
endmodule