'Each input should get a separate ID.'

def test_render_increment_id(self):

    self.check_html(self.widget, 'letters', ['a', 'b', 'c'], attrs={'id': 'hideme'}, html='<input    type="hidden"    name="letters"    value="a"    id="hideme_0"    />\n<input    type="hidden"    name="letters"    value="b"    id="hideme_1"    />\n<input    type="hidden"    name="letters"    value="c"    id="hideme_2"    />')
