<?php

$PATH = 'path/to/drupal.site/core';
Upv::processFolder($PATH, '');

class Upv {

  public static function processFile($filename, $postfix='') {
    $text = file_get_contents($filename);
    $result = preg_replace('/^(\s*)(protected )?(?=(?:static )?function\s+test[A-Z])/m', '\1'.'public ', $text);
    file_put_contents($filename.$postfix, $result);
  }

  public static function processFolder($dir, $postfix='')
  {
    $directory = new \RecursiveDirectoryIterator($dir);
    $iterator = new \RecursiveIteratorIterator($directory);
    $pattern = '/^.+Test\.php$/i';
    $regex = new \RegexIterator($iterator, $pattern, \RecursiveRegexIterator::GET_MATCH);
    foreach ($regex as $name => $object) {
      static::processFile($name, $postfix);
    }
  }
}