def METHOD_NAME(self):
    block = StatisticsBlock()
    cleaned_value = block.clean({
        'visualization': 'statistics/visualizations/big-number.html',
        'dataset': 'no_params',
        'params': '',
    })
    self.assertEqual(cleaned_value, {
        'visualization': 'statistics/visualizations/big-number.html',
        'dataset': 'no_params',
        'params': '',
    })