'If the value is None, none of the options are selected.'

def test_render_none(self):

    self.check_html(self.widget(choices=self.beatles), 'beatles', None, html='<ul>\n                                                <li><label><input    type="checkbox"    name="beatles"    value="J"    />    John</label></li>\n                                                <li><label><input    type="checkbox"    name="beatles"    value="P"    />    Paul</label></li>\n                                                <li><label><input    type="checkbox"    name="beatles"    value="G"    />    George</label></li>\n                                                <li><label><input    type="checkbox"    name="beatles"    value="R"    />    Ringo</label></li>\n                                                </ul>')
