Inserting the content 

$ua->get_ok($new_article_form);

my $form = $ua->select_form_with_field('title');

$ua->set_fields(
    'title'             => $art->{title},
    'summary'           => $art->{summary} || '',
    'filename'          => $filename,
    'weight'            => $art->{weight}  || 0,
    'nav_exclude'       => $nav_exclude,
    'hot_topic'         => $hot_topic,
    'taxonomy[tags][4]' => $art->{keywords},
    'body'              => $art->{content},
    'status'            => $published_status,
    'date'              => $art->{updated_at},
);

$ua->submit;

my($link) = $ua->find_link(text_regex => qr/^Edit$/)
  or die "Create failed!?!\n" . extract_drupal_error();