run-tests.sh 25.7 KB
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<?php
/**
 * @file
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 * This script runs Drupal tests from command line.
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 */

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const SIMPLETEST_SCRIPT_COLOR_PASS = 32; // Green.
const SIMPLETEST_SCRIPT_COLOR_FAIL = 31; // Red.
const SIMPLETEST_SCRIPT_COLOR_EXCEPTION = 33; // Brown.
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// Set defaults and get overrides.
list($args, $count) = simpletest_script_parse_args();

if ($args['help'] || $count == 0) {
  simpletest_script_help();
  exit;
}

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if ($args['execute-test']) {
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  // Masquerade as Apache for running tests.
  simpletest_script_init("Apache");
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  simpletest_script_run_one_test($args['test-id'], $args['execute-test']);
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  // Sub-process script execution ends here.
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}
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else {
  // Run administrative functions as CLI.
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  simpletest_script_init(NULL);
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}
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// Bootstrap to perform initial validation or other operations.
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drupal_bootstrap(DRUPAL_BOOTSTRAP_CODE);
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if (!module_exists('simpletest')) {
  simpletest_script_print_error("The simpletest module must be enabled before this script can run.");
  exit;
}

if ($args['clean']) {
  // Clean up left-over times and directories.
  simpletest_clean_environment();
  echo "\nEnvironment cleaned.\n";

  // Get the status messages and print them.
  $messages = array_pop(drupal_get_messages('status'));
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  foreach ($messages as $text) {
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    echo " - " . $text . "\n";
  }
  exit;
}

if ($args['list']) {
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  // Display all available tests.
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  echo "\nAvailable test groups & classes\n";
  echo   "-------------------------------\n\n";
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  $groups = simpletest_test_get_all();
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  foreach ($groups as $group => $tests) {
    echo $group . "\n";
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    foreach ($tests as $class => $info) {
      echo " - " . $info['name'] . ' (' . $class . ')' . "\n";
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    }
  }
  exit;
}

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$test_list = simpletest_script_get_test_list();

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// Try to allocate unlimited time to run the tests.
drupal_set_time_limit(0);
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simpletest_script_reporter_init();

// Execute tests.
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for ($i = 0; $i < $args['repeat']; $i++) {
  simpletest_script_execute_batch($test_list);
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}
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// Stop the timer.
simpletest_script_reporter_timer_stop();

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// Display results before database is cleared.
simpletest_script_reporter_display_results();

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if ($args['xml']) {
  simpletest_script_reporter_write_xml_results();
}

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// Clean up all test results.
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if (!$args['keep-results']) {
  simpletest_clean_results_table();
}
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// Test complete, exit.
exit;

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/**
 * Print help text.
 */
function simpletest_script_help() {
  global $args;
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  echo <<<EOF

Run Drupal tests from the shell.

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Usage:        {$args['script']} [OPTIONS] <tests>
Example:      {$args['script']} Profile
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All arguments are long options.

  --help      Print this page.
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  --list      Display all available test groups.

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  --clean     Cleans up database tables or directories from previous, failed,
              tests and then exits (no tests are run).

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  --url       Immediately precedes a URL to set the host and path. You will
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              need this parameter if Drupal is in a subdirectory on your
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              localhost and you have not set \$base_url in settings.php. Tests
              can be run under SSL by including https:// in the URL.
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  --php       The absolute path to the PHP executable. Usually not needed.
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  --concurrency [num]

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              Run tests in parallel, up to [num] tests at a time.
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  --all       Run all available tests.
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  --module    Run all tests belonging to the specified module name.
              (e.g., 'node')

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  --class     Run tests identified by specific class names, instead of group names.
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  --file      Run tests identified by specific file names, instead of group names.
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              Specify the path and the extension
              (i.e. 'core/modules/user/user.test').
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  --xml       <path>

              If provided, test results will be written as xml files to this path.

  --color     Output text format results with color highlighting.
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  --verbose   Output detailed assertion messages in addition to summary.

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  --keep-results

              Keeps detailed assertion results (in the database) after tests
              have completed. By default, assertion results are cleared.

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  --repeat    Number of times to repeat the test.

  --die-on-fail

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              Exit test execution immediately upon any failed assertion. This
              allows to access the test site by changing settings.php to use the
              test database and configuration directories. Use in combination
              with --repeat for debugging random test failures.
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  <test1>[,<test2>[,<test3> ...]]

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              One or more tests to be run. By default, these are interpreted
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              as the names of test groups as shown at
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              admin/config/development/testing.
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              These group names typically correspond to module names like "User"
              or "Profile" or "System", but there is also a group "XML-RPC".
              If --class is specified then these are interpreted as the names of
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              specific test classes whose test methods will be run. Tests must
              be separated by commas. Ignored if --all is specified.
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To run this script you will normally invoke it from the root directory of your
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Drupal installation as the webserver user (differs per configuration), or root:
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sudo -u [wwwrun|www-data|etc] php ./core/scripts/{$args['script']}
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  --url http://example.com/ --all
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sudo -u [wwwrun|www-data|etc] php ./core/scripts/{$args['script']}
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  --url http://example.com/ --class "Drupal\block\Tests\BlockTest"
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\n
EOF;
}

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/**
 * Parse execution argument and ensure that all are valid.
 *
 * @return The list of arguments.
 */
function simpletest_script_parse_args() {
  // Set default values.
  $args = array(
    'script' => '',
    'help' => FALSE,
    'list' => FALSE,
    'clean' => FALSE,
    'url' => '',
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    'php' => '',
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    'concurrency' => 1,
    'all' => FALSE,
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    'module' => FALSE,
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    'class' => FALSE,
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    'file' => FALSE,
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    'color' => FALSE,
    'verbose' => FALSE,
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    'keep-results' => FALSE,
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    'test_names' => array(),
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    'repeat' => 1,
    'die-on-fail' => FALSE,
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    // Used internally.
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    'test-id' => 0,
    'execute-test' => '',
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    'xml' => '',
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  );

  // Override with set values.
  $args['script'] = basename(array_shift($_SERVER['argv']));

  $count = 0;
  while ($arg = array_shift($_SERVER['argv'])) {
    if (preg_match('/--(\S+)/', $arg, $matches)) {
      // Argument found.
      if (array_key_exists($matches[1], $args)) {
        // Argument found in list.
        $previous_arg = $matches[1];
        if (is_bool($args[$previous_arg])) {
          $args[$matches[1]] = TRUE;
        }
        else {
          $args[$matches[1]] = array_shift($_SERVER['argv']);
        }
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        // Clear extraneous values.
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        $args['test_names'] = array();
        $count++;
      }
      else {
        // Argument not found in list.
        simpletest_script_print_error("Unknown argument '$arg'.");
        exit;
      }
    }
    else {
      // Values found without an argument should be test names.
      $args['test_names'] += explode(',', $arg);
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      $count++;
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    }
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  }
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  // Validate the concurrency argument
  if (!is_numeric($args['concurrency']) || $args['concurrency'] <= 0) {
    simpletest_script_print_error("--concurrency must be a strictly positive integer.");
    exit;
  }

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  return array($args, $count);
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}

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/**
 * Initialize script variables and perform general setup requirements.
 */
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function simpletest_script_init($server_software) {
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  global $args, $php;

  $host = 'localhost';
  $path = '';
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  // Determine location of php command automatically, unless a command line argument is supplied.
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  if (!empty($args['php'])) {
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    $php = $args['php'];
  }
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  elseif ($php_env = getenv('_')) {
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    // '_' is an environment variable set by the shell. It contains the command that was executed.
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    $php = $php_env;
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  }
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  elseif ($sudo = getenv('SUDO_COMMAND')) {
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    // 'SUDO_COMMAND' is an environment variable set by the sudo program.
    // Extract only the PHP interpreter, not the rest of the command.
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    list($php, ) = explode(' ', $sudo, 2);
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  }
  else {
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    simpletest_script_print_error('Unable to automatically determine the path to the PHP interpreter. Supply the --php command line argument.');
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    simpletest_script_help();
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    exit();
  }
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  // Get URL from arguments.
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  if (!empty($args['url'])) {
    $parsed_url = parse_url($args['url']);
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    $host = $parsed_url['host'] . (isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '');
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    $path = isset($parsed_url['path']) ? $parsed_url['path'] : '';
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    // If the passed URL schema is 'https' then setup the $_SERVER variables
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    // properly so that testing will run under HTTPS.
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    if ($parsed_url['scheme'] == 'https') {
      $_SERVER['HTTPS'] = 'on';
    }
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  }

  $_SERVER['HTTP_HOST'] = $host;
  $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
  $_SERVER['SERVER_ADDR'] = '127.0.0.1';
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  $_SERVER['SERVER_SOFTWARE'] = $server_software;
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  $_SERVER['SERVER_NAME'] = 'localhost';
  $_SERVER['REQUEST_URI'] = $path .'/';
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  $_SERVER['REQUEST_METHOD'] = 'GET';
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  $_SERVER['SCRIPT_NAME'] = $path .'/index.php';
  $_SERVER['PHP_SELF'] = $path .'/index.php';
  $_SERVER['HTTP_USER_AGENT'] = 'Drupal command line';

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  if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
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    // Ensure that any and all environment variables are changed to https://.
    foreach ($_SERVER as $key => $value) {
      $_SERVER[$key] = str_replace('http://', 'https://', $_SERVER[$key]);
    }
  }

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  chdir(realpath(__DIR__ . '/../..'));
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  define('DRUPAL_ROOT', getcwd());
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  require_once DRUPAL_ROOT . '/core/includes/bootstrap.inc';
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}

/**
 * Execute a batch of tests.
 */
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function simpletest_script_execute_batch($test_classes) {
  global $args, $test_ids;
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  // Multi-process execution.
  $children = array();
  while (!empty($test_classes) || !empty($children)) {
    while (count($children) < $args['concurrency']) {
      if (empty($test_classes)) {
        break;
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      }
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      // Fork a child process.
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      $test_id = db_insert('simpletest_test_id')->useDefaults(array('test_id'))->execute();
      $test_ids[] = $test_id;
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      $test_class = array_shift($test_classes);
      $command = simpletest_script_command($test_id, $test_class);
      $process = proc_open($command, array(), $pipes, NULL, NULL, array('bypass_shell' => TRUE));

      if (!is_resource($process)) {
        echo "Unable to fork test process. Aborting.\n";
        exit;
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      }

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      // Register our new child.
      $children[] = array(
        'process' => $process,
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        'test_id' => $test_id,
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        'class' => $test_class,
        'pipes' => $pipes,
      );
    }
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    // Wait for children every 200ms.
    usleep(200000);

    // Check if some children finished.
    foreach ($children as $cid => $child) {
      $status = proc_get_status($child['process']);
      if (empty($status['running'])) {
        // The child exited, unregister it.
        proc_close($child['process']);
        if ($status['exitcode']) {
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          echo 'FATAL ' . $child['class'] . ': test runner returned a non-zero error code (' . $status['exitcode'] . ').' . "\n";
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          if ($args['die-on-fail']) {
            list($db_prefix, ) = simpletest_last_test_get($child['test_id']);
            $public_files = variable_get('file_public_path', conf_path() . '/files');
            $test_directory = $public_files . '/simpletest/' . substr($db_prefix, 10);
            echo 'Simpletest database and files kept and test exited immediately on fail so should be reproducible if you change settings.php to use the database prefix '. $db_prefix . ' and config directories in '. $test_directory . "\n";
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            $args['keep-results'] = TRUE;
            // Exit repeat loop immediately.
            $args['repeat'] = -1;
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          }
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        }
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        // Free-up space by removing any potentially created resources.
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        if (!$args['keep-results']) {
          simpletest_script_cleanup($child['test_id'], $child['class'], $status['exitcode']);
        }
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        // Remove this child.
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        unset($children[$cid]);
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      }
    }
  }
}

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/**
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 * Bootstrap Drupal and run a single test.
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 */
function simpletest_script_run_one_test($test_id, $test_class) {
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  global $args, $conf;

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  try {
    // Bootstrap Drupal.
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    drupal_bootstrap(DRUPAL_BOOTSTRAP_CODE);
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    simpletest_classloader_register();

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    // Override configuration according to command line parameters.
    $conf['simpletest.settings']['verbose'] = $args['verbose'];
    $conf['simpletest.settings']['clear_results'] = !$args['keep-results'];

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    $test = new $test_class($test_id);
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    $test->dieOnFail = (bool) $args['die-on-fail'];
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    $test->run();
    $info = $test->getInfo();

    $had_fails = (isset($test->results['#fail']) && $test->results['#fail'] > 0);
    $had_exceptions = (isset($test->results['#exception']) && $test->results['#exception'] > 0);
    $status = ($had_fails || $had_exceptions ? 'fail' : 'pass');
    simpletest_script_print($info['name'] . ' ' . _simpletest_format_summary_line($test->results) . "\n", simpletest_script_color_code($status));
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    // Finished, kill this runner.
    exit(0);
  }
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  // DrupalTestCase::run() catches exceptions already, so this is only reached
  // when an exception is thrown in the wrapping test runner environment.
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  catch (Exception $e) {
    echo (string) $e;
    exit(1);
  }
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}

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/**
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 * Return a command used to run a test in a separate process.
 *
 * @param $test_id
 *  The current test ID.
 * @param $test_class
 *  The name of the test class to run.
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 */
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function simpletest_script_command($test_id, $test_class) {
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  global $args, $php;
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  $command = escapeshellarg($php) . ' ' . escapeshellarg('./core/scripts/' . $args['script']);
  $command .= ' --url ' . escapeshellarg($args['url']);
  $command .= ' --php ' . escapeshellarg($php);
  $command .= " --test-id $test_id";
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  foreach (array('verbose', 'keep-results', 'color', 'die-on-fail') as $arg) {
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    if ($args[$arg]) {
      $command .= ' --' . $arg;
    }
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  }
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  // --execute-test and class name needs to come last.
  $command .= ' --execute-test ' . escapeshellarg($test_class);
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  return $command;
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}

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/**
 * Removes all remnants of a test runner.
 *
 * In case a (e.g., fatal) error occurs after the test site has been fully setup
 * and the error happens in many tests, the environment that executes the tests
 * can easily run out of memory or disk space. This function ensures that all
 * created resources are properly cleaned up after every executed test.
 *
 * This clean-up only exists in this script, since SimpleTest module itself does
 * not use isolated sub-processes for each test being run, so a fatal error
 * halts not only the test, but also the test runner (i.e., the parent site).
 *
 * @param int $test_id
 *   The test ID of the test run.
 * @param string $test_class
 *   The class name of the test run.
 * @param int $exitcode
 *   The exit code of the test runner.
 *
 * @see simpletest_script_run_one_test()
 */
function simpletest_script_cleanup($test_id, $test_class, $exitcode) {
  // Retrieve the last database prefix used for testing.
  list($db_prefix, ) = simpletest_last_test_get($test_id);

  // If no database prefix was found, then the test was not set up correctly.
  if (empty($db_prefix)) {
    echo "\nFATAL $test_class: Found no database prefix for test ID $test_id. (Check whether setUp() is invoked correctly.)";
    return;
  }

  // Do not output verbose cleanup messages in case of a positive exitcode.
  $output = !empty($exitcode);
  $messages = array();

  $messages[] = "- Found database prefix '$db_prefix' for test ID $test_id.";

  // Read the log file in case any fatal errors caused the test to crash.
  simpletest_log_read($test_id, $db_prefix, $test_class);

  // Check whether a test file directory was setup already.
  // @see prepareEnvironment()
  $public_files = variable_get('file_public_path', conf_path() . '/files');
  $test_directory = $public_files . '/simpletest/' . substr($db_prefix, 10);
  if (is_dir($test_directory)) {
    // Output the error_log.
    if (is_file($test_directory . '/error.log')) {
      if ($errors = file_get_contents($test_directory . '/error.log')) {
        $output = TRUE;
        $messages[] = $errors;
      }
    }

    // Delete the test files directory.
    // simpletest_clean_temporary_directories() cannot be used here, since it
    // would also delete file directories of other tests that are potentially
    // running concurrently.
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    file_unmanaged_delete_recursive($test_directory, array('Drupal\simpletest\TestBase', 'filePreDeleteCallback'));
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    $messages[] = "- Removed test files directory.";
  }

  // Clear out all database tables from the test.
  $count = 0;
  foreach (db_find_tables($db_prefix . '%') as $table) {
    db_drop_table($table);
    $count++;
  }
  if ($count) {
    $messages[] = "- " . format_plural($count, 'Removed 1 leftover table.', 'Removed @count leftover tables.');
  }

  if ($output) {
    echo implode("\n", $messages);
    echo "\n";
  }
}

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/**
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 * Get list of tests based on arguments. If --all specified then
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 * returns all available tests, otherwise reads list of tests.
 *
 * Will print error and exit if no valid tests were found.
 *
 * @return List of tests.
 */
function simpletest_script_get_test_list() {
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  global $args;
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  $test_list = array();
  if ($args['all']) {
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    $groups = simpletest_test_get_all();
    $all_tests = array();
    foreach ($groups as $group => $tests) {
      $all_tests = array_merge($all_tests, array_keys($tests));
    }
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    $test_list = $all_tests;
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  }
  else {
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    if ($args['class']) {
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      foreach ($args['test_names'] as $class_name) {
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        $test_list[] = $class_name;
      }
    }
    elseif ($args['module']) {
      $modules = drupal_system_listing('/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.module$/', 'modules', 'name', 0);
      foreach ($args['test_names'] as $module) {
        // PSR-0 only.
        $dir = dirname($modules[$module]->uri) . "/lib/Drupal/$module/Tests";
        $files = file_scan_directory($dir, '@\.php$@', array(
          'key' => 'name',
          'recurse' => TRUE,
        ));
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        foreach ($files as $test => $file) {
          $test_list[] = "Drupal\\$module\\Tests\\$test";
        }
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      }
    }
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    elseif ($args['file']) {
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      // Extract test case class names from specified files.
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      foreach ($args['test_names'] as $file) {
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        if (!file_exists($file)) {
          simpletest_script_print_error('File not found: ' . $file);
          exit;
        }
        $content = file_get_contents($file);
        // Extract a potential namespace.
        $namespace = FALSE;
        if (preg_match('@^namespace ([^ ;]+)@m', $content, $matches)) {
          $namespace = $matches[1];
        }
        // Extract all class names.
        // Abstract classes are excluded on purpose.
        preg_match_all('@^class ([^ ]+)@m', $content, $matches);
        if (!$namespace) {
          $test_list = array_merge($test_list, $matches[1]);
        }
        else {
          foreach ($matches[1] as $class_name) {
            $test_list[] = $namespace . '\\' . $class_name;
          }
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        }
      }
    }
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    else {
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      $groups = simpletest_test_get_all();
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      foreach ($args['test_names'] as $group_name) {
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        $test_list = array_merge($test_list, array_keys($groups[$group_name]));
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      }
    }
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  }
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  if (empty($test_list)) {
    simpletest_script_print_error('No valid tests were specified.');
    exit;
  }
  return $test_list;
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}

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/**
 * Initialize the reporter.
 */
function simpletest_script_reporter_init() {
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  global $args, $test_list, $results_map;
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  $results_map = array(
    'pass' => 'Pass',
    'fail' => 'Fail',
    'exception' => 'Exception'
  );
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  echo "\n";
  echo "Drupal test run\n";
  echo "---------------\n";
  echo "\n";
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  // Tell the user about what tests are to be run.
  if ($args['all']) {
    echo "All tests will run.\n\n";
  }
  else {
    echo "Tests to be run:\n";
    foreach ($test_list as $class_name) {
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      $info = call_user_func(array($class_name, 'getInfo'));
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      echo " - " . $info['name'] . ' (' . $class_name . ')' . "\n";
    }
    echo "\n";
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  }
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  echo "Test run started:\n";
  echo " " . format_date($_SERVER['REQUEST_TIME'], 'long') . "\n";
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  timer_start('run-tests');
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  echo "\n";

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  echo "Test summary\n";
  echo "------------\n";
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  echo "\n";
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}

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/**
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 * Display jUnit XML test results.
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 */
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function simpletest_script_reporter_write_xml_results() {
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  global $args, $test_ids, $results_map;
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  $results = db_query("SELECT * FROM {simpletest} WHERE test_id IN (:test_ids) ORDER BY test_class, message_id", array(':test_ids' => $test_ids));
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  $test_class = '';
  $xml_files = array();

  foreach ($results as $result) {
    if (isset($results_map[$result->status])) {
      if ($result->test_class != $test_class) {
        // We've moved onto a new class, so write the last classes results to a file:
        if (isset($xml_files[$test_class])) {
          file_put_contents($args['xml'] . '/' . $test_class . '.xml', $xml_files[$test_class]['doc']->saveXML());
          unset($xml_files[$test_class]);
        }
        $test_class = $result->test_class;
        if (!isset($xml_files[$test_class])) {
          $doc = new DomDocument('1.0');
          $root = $doc->createElement('testsuite');
          $root = $doc->appendChild($root);
          $xml_files[$test_class] = array('doc' => $doc, 'suite' => $root);
        }
      }

      // For convenience:
      $dom_document = &$xml_files[$test_class]['doc'];

      // Create the XML element for this test case:
      $case = $dom_document->createElement('testcase');
      $case->setAttribute('classname', $test_class);
      list($class, $name) = explode('->', $result->function, 2);
      $case->setAttribute('name', $name);

      // Passes get no further attention, but failures and exceptions get to add more detail:
      if ($result->status == 'fail') {
        $fail = $dom_document->createElement('failure');
        $fail->setAttribute('type', 'failure');
        $fail->setAttribute('message', $result->message_group);
        $text = $dom_document->createTextNode($result->message);
        $fail->appendChild($text);
        $case->appendChild($fail);
      }
      elseif ($result->status == 'exception') {
        // In the case of an exception the $result->function may not be a class
        // method so we record the full function name:
        $case->setAttribute('name', $result->function);

        $fail = $dom_document->createElement('error');
        $fail->setAttribute('type', 'exception');
        $fail->setAttribute('message', $result->message_group);
        $full_message = $result->message . "\n\nline: " . $result->line . "\nfile: " . $result->file;
        $text = $dom_document->createTextNode($full_message);
        $fail->appendChild($text);
        $case->appendChild($fail);
      }
      // Append the test case XML to the test suite:
      $xml_files[$test_class]['suite']->appendChild($case);
    }
  }
  // The last test case hasn't been saved to a file yet, so do that now:
  if (isset($xml_files[$test_class])) {
    file_put_contents($args['xml'] . '/' . $test_class . '.xml', $xml_files[$test_class]['doc']->saveXML());
    unset($xml_files[$test_class]);
  }
}

/**
 * Stop the test timer.
 */
function simpletest_script_reporter_timer_stop() {
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  echo "\n";
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  $end = timer_stop('run-tests');
  echo "Test run duration: " . format_interval($end['time'] / 1000);
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  echo "\n\n";
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}

/**
 * Display test results.
 */
function simpletest_script_reporter_display_results() {
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  global $args, $test_ids, $results_map;
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  if ($args['verbose']) {
    // Report results.
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    echo "Detailed test results\n";
    echo "---------------------\n";
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    $results = db_query("SELECT * FROM {simpletest} WHERE test_id IN (:test_ids) ORDER BY test_class, message_id", array(':test_ids' => $test_ids));
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    $test_class = '';
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    foreach ($results as $result) {
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      if (isset($results_map[$result->status])) {
        if ($result->test_class != $test_class) {
          // Display test class every time results are for new test class.
          echo "\n\n---- $result->test_class ----\n\n\n";
          $test_class = $result->test_class;
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          // Print table header.
          echo "Status    Group      Filename          Line Function                            \n";
          echo "--------------------------------------------------------------------------------\n";
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        }

        simpletest_script_format_result($result);
      }
    }
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  }
}

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/**
 * Format the result so that it fits within the default 80 character
 * terminal size.
 *
 * @param $result The result object to format.
 */
function simpletest_script_format_result($result) {
  global $results_map, $color;

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  $summary = sprintf("%-9.9s %-10.10s %-17.17s %4.4s %-35.35s\n",
    $results_map[$result->status], $result->message_group, basename($result->file), $result->line, $result->function);
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  simpletest_script_print($summary, simpletest_script_color_code($result->status));
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  $lines = explode("\n", wordwrap(trim(strip_tags($result->message)), 76));
  foreach ($lines as $line) {
    echo "    $line\n";
  }
}
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/**
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 * Print error message prefixed with "  ERROR: " and displayed in fail color
 * if color output is enabled.
 *
 * @param $message The message to print.
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 */
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function simpletest_script_print_error($message) {
  simpletest_script_print("  ERROR: $message\n", SIMPLETEST_SCRIPT_COLOR_FAIL);
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}
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/**
 * Print a message to the console, if color is enabled then the specified
 * color code will be used.
 *
 * @param $message The message to print.
 * @param $color_code The color code to use for coloring.
 */
function simpletest_script_print($message, $color_code) {
  global $args;
  if ($args['color']) {
    echo "\033[" . $color_code . "m" . $message . "\033[0m";
  }
  else {
    echo $message;
  }
}

/**
 * Get the color code associated with the specified status.
 *
 * @param $status The status string to get code for.
 * @return Color code.
 */
function simpletest_script_color_code($status) {
  switch ($status) {
    case 'pass':
      return SIMPLETEST_SCRIPT_COLOR_PASS;
    case 'fail':
      return SIMPLETEST_SCRIPT_COLOR_FAIL;
    case 'exception':
      return SIMPLETEST_SCRIPT_COLOR_EXCEPTION;
  }
  return 0; // Default formatting.
}