Example of Test::Mojo used to unit test.
#!/usr/bin/env perl
use strict;
use warnings;
use Test::More tests => 6;
use Test::Mojo;
my $url = 'http://localhost/~rhaen/index.html';
my $t = Test::Mojo->new;
# Easy - get the title string
$t->get_ok($url)
->text_is('html head title'
=> 'Hello', 'correct title');
# Still easy - get the <a> test
$t->get_ok($url)
->text_is('a[target]'
=> 'Hello page', 'correct text for a tag');
# Advanced - checking for attribute value
$t->get_ok($url)
->element_exists('a[href=Hello.html]', 'Yep, attribute value ok');
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<title>Hello</title>
</head>
<body>
<ul>
<li>
<a href="Goodbye.html">Goodbye page</a>
</li>
<li>
<a href="Hello.html" target="_blank">Hello page</a>
</li>
</ul>
</body>
</html>