Tests exploiting the temporary file removal for anonymous users using fid.
public function testTemporaryFileRemovalExploitAnonymous() {
  // Set up an anonymous victim user.
  $victim_uid = 0;
  // Set up an anonymous attacker user.
  $attacker_uid = 0;
  // Set up permissions for anonymous attacker user.
  user_role_change_permissions(DRUPAL_ANONYMOUS_RID, array(
    'access content' => TRUE,
    'create page content' => TRUE,
    'edit any page content' => TRUE,
  ));
  // In order to simulate being the anonymous attacker user, we need to log
  // out here since setUp() has logged in the admin.
  $this
    ->drupalLogout();
  // Perform tests using the newly set up users.
  $this
    ->doTestTemporaryFileRemovalExploit($victim_uid, $attacker_uid);
}