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diff --git a/vendor/drush/drush/tests/bootstrap.inc b/vendor/drush/drush/tests/bootstrap.inc
new file mode 100644
index 000000000..be5b978e9
--- /dev/null
+++ b/vendor/drush/drush/tests/bootstrap.inc
@@ -0,0 +1,175 @@
+<?php
+
+/**
+ * @file
+ *   Initialize a sandboxed environment. Starts with call unish_init() at bottom.
+ */
+
+// This code copied from drush_bootstrap_prepare() except for 1st line.
+$drush_base_path = dirname(__DIR__);
+$local_vendor_path = $drush_base_path . '/vendor/autoload.php';
+$global_vendor_path = $drush_base_path . '/../../../vendor/autoload.php';
+// Check for a local composer install or a global composer install. Vendor dirs are in different spots.
+if ((!@include $local_vendor_path) && (!@include $global_vendor_path)) {
+  $msg = "Unable to load autoload.php. Drush now requires Composer in order to install its dependencies and autoload classes. Please see http://docs.drush.org/en/master/install/\n";
+  fwrite(STDERR, $msg);
+  return FALSE;
+}
+
+unish_init();
+
+/**
+ * Initialize our environment at the start of each run (i.e. suite).
+ */
+function unish_init() {
+  // Default drupal major version to run tests over.
+  $unish_drupal_major = '8';
+  if (getenv('UNISH_DRUPAL_MAJOR_VERSION')) {
+    $unish_drupal_major = getenv('UNISH_DRUPAL_MAJOR_VERSION');
+  }
+  elseif (isset($GLOBALS['UNISH_DRUPAL_MAJOR_VERSION'])) {
+    $unish_drupal_major = $GLOBALS['UNISH_DRUPAL_MAJOR_VERSION'];
+  }
+  define('UNISH_DRUPAL_MAJOR_VERSION', $unish_drupal_major);
+
+  // We read from env then globals then default to mysql.
+  $unish_db_url = 'mysql://root:@127.0.0.1';
+  if (getenv('UNISH_DB_URL')) {
+    $unish_db_url = getenv('UNISH_DB_URL');
+  }
+  elseif (isset($GLOBALS['UNISH_DB_URL'])) {
+    $unish_db_url = $GLOBALS['UNISH_DB_URL'];
+  }
+  define('UNISH_DB_URL', $unish_db_url);
+
+  // UNISH_DRUSH value can come from phpunit.xml.
+  if (!defined('UNISH_DRUSH')) {
+    // Let the UNISH_DRUSH environment variable override if set.
+    $unish_drush = isset($_SERVER['UNISH_DRUSH']) ? $_SERVER['UNISH_DRUSH'] : NULL;
+    $unish_drush = isset($GLOBALS['UNISH_DRUSH']) ? $GLOBALS['UNISH_DRUSH'] : $unish_drush;
+    if (empty($unish_drush)) {
+      $script = \Unish\UnitUnishTestCase::is_windows() ? 'dr.bat' : 'drush';
+      $unish_drush =  dirname(__DIR__) . DIRECTORY_SEPARATOR . $script;
+    }
+    define('UNISH_DRUSH', $unish_drush);
+  }
+
+  define('UNISH_TMP', realpath(getenv('UNISH_TMP') ? getenv('UNISH_TMP') : (isset($GLOBALS['UNISH_TMP']) ? $GLOBALS['UNISH_TMP'] : sys_get_temp_dir())));
+  define('UNISH_SANDBOX', UNISH_TMP . DIRECTORY_SEPARATOR . 'drush-sandbox');
+
+  // Cache dir lives outside the sandbox so that we get persistence across classes.
+  define('UNISH_CACHE', UNISH_TMP . DIRECTORY_SEPARATOR . 'drush-cache');
+  putenv("CACHE_PREFIX=" . UNISH_CACHE);
+  // Wipe at beginning of run.
+  if (file_exists(UNISH_CACHE)) {
+    // TODO: We no longer clean up cache dir between runs. Much faster, but we
+    // we should watch for subtle problems. To manually clean up, delete the
+    // UNISH_TMP/drush-cache directory.
+    // unish_file_delete_recursive($cache, TRUE);
+  }
+  else {
+    $ret = mkdir(UNISH_CACHE, 0777, TRUE);
+  }
+
+  $home = UNISH_SANDBOX . DIRECTORY_SEPARATOR . 'home';
+  putenv("HOME=$home");
+  putenv("HOMEDRIVE=$home");
+
+  putenv('ETC_PREFIX=' . UNISH_SANDBOX);
+  putenv('SHARE_PREFIX=' . UNISH_SANDBOX);
+  putenv('TEMP=' . UNISH_TMP);
+
+  define('UNISH_USERGROUP', isset($GLOBALS['UNISH_USERGROUP']) ? $GLOBALS['UNISH_USERGROUP'] : NULL);
+
+  define('UNISH_BACKEND_OUTPUT_DELIMITER', 'DRUSH_BACKEND_OUTPUT_START>>>%s<<<DRUSH_BACKEND_OUTPUT_END');
+}
+
+/**
+ * Deletes the specified file or directory and everything inside it.
+ *
+ * Usually respects read-only files and folders. To do a forced delete use
+ * drush_delete_tmp_dir() or set the parameter $forced.
+ *
+ * To avoid permission denied error on Windows, make sure your CWD is not
+ * inside the directory being deleted.
+ *
+ * This is essentially a copy of drush_delete_dir().
+ *
+ * @todo This sort of duplication isn't very DRY. This is bound to get out of
+ *   sync with drush_delete_dir(), as in fact it already has before.
+ *
+ * @param string $dir
+ *   The file or directory to delete.
+ * @param bool $force
+ *   Whether or not to try everything possible to delete the directory, even if
+ *   it's read-only. Defaults to FALSE.
+ * @param bool $follow_symlinks
+ *   Whether or not to delete symlinked files. Defaults to FALSE--simply
+ *   unlinking symbolic links.
+ *
+ * @return bool
+ *   FALSE on failure, TRUE if everything was deleted.
+ *
+ * @see drush_delete_dir()
+ */
+function unish_file_delete_recursive($dir, $force = TRUE, $follow_symlinks = FALSE) {
+  // Do not delete symlinked files, only unlink symbolic links
+  if (is_link($dir) && !$follow_symlinks) {
+    return unlink($dir);
+  }
+  // Allow to delete symlinks even if the target doesn't exist.
+  if (!is_link($dir) && !file_exists($dir)) {
+    return TRUE;
+  }
+  if (!is_dir($dir)) {
+    if ($force) {
+      // Force deletion of items with readonly flag.
+      @chmod($dir, 0777);
+    }
+    return unlink($dir);
+  }
+  if (unish_delete_dir_contents($dir, $force) === FALSE) {
+    return FALSE;
+  }
+  if ($force) {
+    // Force deletion of items with readonly flag.
+    @chmod($dir, 0777);
+  }
+  return rmdir($dir);
+}
+
+/**
+ * Deletes the contents of a directory.
+ *
+ * This is essentially a copy of drush_delete_dir_contents().
+ *
+ * @param string $dir
+ *   The directory to delete.
+ * @param bool $force
+ *   Whether or not to try everything possible to delete the contents, even if
+ *   they're read-only. Defaults to FALSE.
+ *
+ * @return bool
+ *   FALSE on failure, TRUE if everything was deleted.
+ *
+ * @see drush_delete_dir_contents()
+ */
+function unish_delete_dir_contents($dir, $force = FALSE) {
+  $scandir = @scandir($dir);
+  if (!is_array($scandir)) {
+    return FALSE;
+  }
+
+  foreach ($scandir as $item) {
+    if ($item == '.' || $item == '..') {
+      continue;
+    }
+    if ($force) {
+      @chmod($dir, 0777);
+    }
+    if (!unish_file_delete_recursive($dir . '/' . $item, $force)) {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}