public void テスト()
        {
            TestContext.Run((int taxRate, int price, int expected) =>
                            {
                                var sut = new ConsumptionTax(taxRate);

                                sut.Apply(price).Is(expected);
                            });
        }
 public void オブジェクトの生成()
 {
     var sut = new ConsumptionTax(5);
 }