batch_operations/batch_test.php

<?php
/**
 * Plugin Name: Batch operations TEST
 * Description: DEV TEST
 * Version: 0.1.0
 * Author: Igor V Belousov
 * Author URI: http://belousovv.ru/
 */

add_action( 'admin_menu', 'batch_operations_test_add_page' );

function batch_operations_test_add_page() {
  add_management_page( 'Batch operations TEST', 'Batch TEST', 'edit_posts', 'batch-operations-test', 'batch_operations_test_page_view' );
}

function batch_operations_test_page_view() {

  $test = ( empty ($_REQUEST["test"] ) )? 0 : $_REQUEST["test"];

  switch ($test) {
    case 2:
      $batch['operations'][]=array('test_batch_operation',array());
      batch_operations_start($batch);
      break;

    case 3:
      $batch['title']="Custom Title";
      $batch['init_message']="Custom Init Message";
      $batch['operations'][]=array('test_batch_operation',array());
      batch_operations_start($batch);
      break;

    case 4:
      $batch['operations'][]=array('test_batch_operation',array());
      $batch['operations'][]=array('test_batch_operation',array());
      $batch['operations'][]=array('test_batch_operation',array());
      $batch['operations'][]=array('test_batch_operation',array());
      $batch['operations'][]=array('test_batch_operation',array());
      batch_operations_start($batch);
      break;
    default:
      break;
  }

  ?>
  <div class="wrap">
    <?php screen_icon(); ?>
    <h2><?php echo get_admin_page_title() ?></h2>
    <ol>
      <li><a href="tools.php?page=batch-operations&id=0">$current_array is empty</a>
      <li><a href="tools.php?page=batch-operations-test&test=2">Default <strong>title</strong> & <strong>init_message</strong></a>
      <li><a href="tools.php?page=batch-operations-test&test=3">Set <strong>custom title</strong> & <strong>custom init_message</strong></a>
      <li><a href="tools.php?page=batch-operations-test&test=4">5 operations</a>
    </ol>
  </div>
  <?php
}

function test_batch_operation(&$context) {
  sleep(1);
  $context['message'] = 'Yeap! Work!';
}