'If a widget has no id, label_tag just returns the text with no
surrounding <label>.'

def test_boundfield_label_tag_no_id(self):

    class SomeForm(Form, ):
        field = CharField()
    boundfield = SomeForm(auto_id=u'')[u'field']
    self.assertHTMLEqual(boundfield.label_tag(), u'Field:')
    self.assertHTMLEqual(boundfield.label_tag(u'Custom&'), u'Custom&amp;:')
