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  // Test case 1

    A  = 8'10101010;
    B  = 8'01010101;
    OP = 3'b110;  // OR

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b11111111 && C == 1'b0 && V == 1'b0 && N == 1'b1 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 11111111), C = %1b (should be 0), V = %1b (should be 0), N = %1b (should be 1), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");

    // Test case 2

    A  = 8'00000000;
    B  = 8'11111111;
    OP = 3'b101;  // AND

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b00000000 && C == 1'b0 && V == 1'b0 && N == 1'b0 && Z == 1'b1) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 00000000), C = %1b (should be 0), V = %1b (should be 0), N = %1b (should be 0), Z = %1b (should be 1)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");

       // Test case 3

    A  = 8'00000000;
    B  = 8'11111111;
    OP = 3'b101;  // OR

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b11111111 && C == 1'b0 && V == 1'b0 && N == 1'b1 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 11111111), C = %1b (should be 0), V = %1b (should be 0), N = %1b (should be 1), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");


    // Test case 4

    A  = 8'10101010;
    B  = 8'11111111;
    OP = 3'b010;  // SRA

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b11010101 && C == 1'b0 && V == 1'b0 && N == 1'b1 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 11010101), C = %1b (should be 0), V = %1b (should be 0), N = %1b (should be 1), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");

	 // Test case 5

    A  = 8'11111111;
    B  = 8'11111111;
    OP = 3'b010;  // SRA

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b11111111 && C == 1'b1 && V == 1'b0 && N == 1'b1 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 11111111), C = %1b (should be 1), V = %1b (should be 0), N = %1b (should be 1), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");


	 // Test case 6

    A  = 8'11111111;
    B  = 8'11111111;
    OP = 3'b011;  // SRL

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b01111111 && C == 1'b1 && V == 1'b0 && N == 1'b0 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 01111111), C = %1b (should be 1), V = %1b (should be 0), N = %1b (should be 0), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");

	 // Test case 7

    A  = 8'11111111;
    B  = 8'11111111;
    OP = 3'b100;  // SLL

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b11111110 && C == 1'b1 && V == 1'b0 && N == 1'b1 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 11111110), C = %1b (should be 1), V = %1b (should be 0), N = %1b (should be 1), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");

	 // Test case 8

    A  = 8'01111110;
    B  = 8'11111111;
    OP = 3'b100;  // SLL

    #100;  // wait for input signals to propagate through circuit

    $display("MSIM>");
    if(Y == 8'b11111100 && C == 1'b0 && V == 1'b0 && N == 1'b1 && Z == 1'b0) begin
      $display("MSIM> AND (OP = %3b) is correct for A = %8b, B = %8b: Y = %8b, C = %1b, V = %1b, N = %1b, Z = %1b", OP, A, B, Y, C, V, N, Z);
    end
    else begin
      $display("MSIM> ERROR: AND (OP = %3b) is incorrect for A = %8b, B = %8b: Y = %8b (should be 11111100), C = %1b (should be 0), V = %1b (should be 0), N = %1b (should be 1), Z = %1b (should be 0)", OP, A, B, Y, C, V, N, Z);
    end
    $display("MSIM>");