'Test that last <br> in tree has a new line tail'

def testBrTailNoNewline(self):

    root = markdown.util.etree.Element(u'root')
    br = markdown.util.etree.SubElement(root, u'br')
    self.assertEqual(br.tail, None)
    self.pretty.run(root)
    self.assertEqual(br.tail, u'\n')
