function test_add_script () {
$p = new Page;
$p->add_script ('/foo.js');
$this->assertEquals ("<script src=\"/foo.js\"></script>\n", $p->head);
$p->add_script ('/bar.js', 'tail');
$this->assertEquals ("<script src=\"/foo.js\"></script>\n", $p->head);
$this->assertEquals ("<script src=\"/bar.js\"></script>\n", $p->tail);
}
