// Build a breadcrumb builder to test.
$breadcrumb_builder = $this->getMock(
'Drupal\forum\Breadcrumb\ForumListingBreadcrumbBuilder', NULL, [
// Build a breadcrumb builder to test.
$breadcrumb_builder = $this->getMock(
'Drupal\forum\Breadcrumb\ForumListingBreadcrumbBuilder', NULL, [