Generates forum topics.
array $forum: The forum array (a row from taxonomy_term_data table).
private function generateForumTopics($forum) {
$this->nids = array();
for ($i = 0; $i < 5; $i++) {
$node = $this
->createForumTopic($this->forum, FALSE);
$this->nids[] = $node->nid;
}
}