gistfile1.txt

$specifiedTag = 'foo';
$found = false;
$tags = $item->getHashTags();
$found = in_array($specifiedTags, $tags);
if(!$found) {
  $comments = $item->getComments();
  foreach($comments as $comment) {
    $tags = $comment->getHashTags();
    $found = in_array($specifiedTags, $tags)
    if($found) {
      break;
    }
  }
}

$this->assertTrue($found, "Hash tag $specifiedTag should be found in the feed item or comments");