def test_comments(self):
doc = HtmlDocument()
with doc.head():
doc.title("das title")
doc.comment("hello")
doc.comment("hello", "world")
self.assertEquals(doc.render(" "), """\
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>das title</title>
<!-- hello -->
<!--
hello
world
-->
</head>
</html>""")
