'HTML export'

def test_html_export_none_value(self):

    html = markup.page()
    html.table.open()
    html.thead.open()
    html.tr(markup.oneliner.th(['foo', '', 'bar']))
    html.thead.close()
    html.tr(markup.oneliner.td(['foo', '', 'bar']))
    html.table.close()
    html = str(html)
    headers = ['foo', None, 'bar']
    d = tablib.Dataset(['foo', None, 'bar'], headers=headers)
    self.assertEqual(html, d.html)
