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`include "uvm_macros.svh"

import uvm_pkg::*;

typedef enum {GOOD, BAD_ERR1, BAD_ERR2} pkt_type;

pkt_type pkt;

`include "callbacks.sv"

`include "driver.sv"

`include "env.sv"

`include "tests.sv"

​

module tb_top;

  initial begin

    run_test();

  end

endmodule

class env extends uvm_env;

  driver drv;

  `uvm_component_utils(env)

  function new(string name = "env", uvm_component parent = null);

    super.new(name,parent);

  endfunction

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    drv = driver::type_id::create("drv", this);

  endfunction

endclass

class base_test extends uvm_test;

  `uvm_component_utils(base_test)

  env env_o;

  function new(string name = "base_test", uvm_component parent = null);

    super.new(name, parent);

  endfunction

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    env_o = env::type_id::create("env_o", this);

  endfunction

endclass

​

class err_test extends base_test;

  derived_cb drvd_cb;

  `uvm_component_utils(err_test)

  function new(string name = "err_test", uvm_component parent = null);

    super.new(name, parent);

  endfunction

  function void build_phase(uvm_phase phase);

    super.build_phase(phase);

    drvd_cb = derived_cb::type_id::create("drvd_cb", this);

    uvm_callbacks#(driver, driver_cb)::add(env_o.drv, drvd_cb);

  endfunction

endclass

class driver_cb extends uvm_callback;

  `uvm_object_utils(driver_cb)

  function new(string name = "driver_cb");

    super.new(name);

  endfunction

  virtual task modify_pkt();

  endtask

endclass

​

class derived_cb extends driver_cb;

  `uvm_object_utils(derived_cb)

  function new(string name = "derived_cb");

    super.new(name);

  endfunction

  task modify_pkt; // callback method implementation

    `uvm_info(get_full_name(),"Inside modify_pkt method: Injecting error pkt",UVM_LOW);

    std::randomize(pkt) with {pkt inside {BAD_ERR1, BAD_ERR2};};

  endtask

endclass