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Source code: *

<?php
class test {
  function pass() {
    echo "Pass\n";
  }
  function fail() {
    echo "Fail\n";
  }
}
function test_clearinghouse($a0 = NULL, &$a1 = NULL, &$a2 = NULL, &$a3 = NULL, &$a4 = NULL, &$a5 = NULL, &$a6 = NULL, &$a7 = NULL, &$a8 = NULL, &$a9 = NULL) {
  static $state = TEST_LOAD, $test, $object;
  switch ($state) {
    case TEST_LOAD:
      if (!isset($object)) {
        $object = new test;
      }
      $test = $a0;
      $state = TEST_START;
      break;
    case TEST_START:
      $state = TEST_IN;
      $function = 'original_'. $a0;
      $num_args = func_num_args();
      switch ($num_args - 1) {
        case 0: $return = $function();break;
        case 1: $return = $function($a1); break;
        case 2: $return = $function($a1, $a2); break;
        case 3: $return = $function($a1, $a2, $a3); break;
        case 4: $return = $function($a1, $a2, $a3, $a4); break;
        case 5: $return = $function($a1, $a2, $a3, $a4, $a5); break;
        case 6: $return = $function($a1, $a2, $a3, $a4, $a5, $a6); break;
        case 7: $return = $function($a1, $a2, $a3, $a4, $a5, $a6, $a7); break;
        case 8: $return = $function($a1, $a2, $a3, $a4, $a5, $a6, $a7, $a8); break;
        case 9: $return = $function($a1, $a2, $a3, $a4, $a5, $a6, $a7, $a8, $a9); break;
      }
      $final_return = $test['final_return'];
      unset($test['final_return']);
      if (!$test && $return === $final_return) {
        $object->pass();
      }
      else {
        $object->fail();
      }
      $state = TEST_LOAD;
      break;
    case TEST_IN:
      $step = array_shift($test);
      $incoming = $step['incoming'];
      $num_args = func_num_args();
      for ($i = 0; $i < $num_args; $i++) {
        $variable_name = "a$i";
        if ($incoming[$i] !== $$variable_name) {
          var_export($$variable_name);
          var_export($incoming[$i]);
          $object->fail();
        }
      }
      if (isset($step['references'])) {
        foreach ($step['references'] as $key => $value) {
          $variable_name = "$a$key";
          $$variable_name = $value;
        }
      }
      if (isset($step['return'])) {
        return $step['return'];
      }
  }
}

function db_query($query) {
  return test_clearinghouse('db_query', $query);
}

function cache_get($cid, $table = 'cache') {
  return test_clearinghouse('cache_get', $cid, $table);
}

function cache_set($cid, $data, $table = 'cache', $expire = CACHE_PERMANENT, $headers = NULL) {
  return test_clearinghouse('cache_set', $cid, $data, $table, $expire, $headers);
}

function db_fetch_object($result) {
  return test_clearinghouse('db_fetch_object', $result);
}

require_once './drupal_original/includes/bootstrap.inc';

$variable_init_test = 
  array(
    array(
      'incoming' => array('cache_get', 'variables', 'cache'),
      'return' => FALSE,
    ),
    array(
      'incoming' => array('db_query', 'SELECT * FROM {variable}'),
      'return' => '__test_placeholder__',
    ),
    array(
      'incoming' => array('db_fetch_object', '__test_placeholder__'),
      'return' => (object) array('name' => 'foo', 'value' => serialize('bar')),
    ),
    array(
      'incoming' => array('db_fetch_object', '__test_placeholder__'),
      'return' => FALSE,
    ),
    array(
      'incoming' => array('cache_set', 'variables', array('foo' => 'bar'), 'cache', CACHE_PERMANENT, NULL),
    ),
    'final_return' => array('foo' => 'bar'),
  );
test_clearinghouse($variable_init_test);
test_clearinghouse('variable_init');
unset($variable_init_test[2]);
$variable_init_test[4]['incoming'][2] = NULL;
$variable_init_test['final_return'] = NULL;
test_clearinghouse($variable_init_test);
test_clearinghouse('variable_init');

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