def METHOD_NAME():
    result = True
    anonymizers = {
        "DEFAULT": {"type": "replace", "new_value": "ANONYMIZED"},
        "PHONE_NUMBER": {"type": "custom", "lambda": "lambda x: x[::-1]"},
    }
    anonymizers_config = AppEntitiesConvertor.operators_config_from_json(anonymizers)
    assert AppEntitiesConvertor.check_custom_operator(anonymizers_config) == result