複利計算--單元測試

對我們和複利計算程式，寫單元測試。 

   有哪些場景？

   期待的傳回值

   寫測試程式。

   運作測試。

測試計算是否正确：

@Test
    public void test0() {//測單利終值
        double money=1000000.0;
        int years=30;
        double r=0.03;
        double sum;
        sum = money + money * years * r;
         Assert.assertEquals(1900000,sum, 1.0);
    }
    @Test
    public void test1(){//測複利終值
        double money=1000000.0;
        int years=30;
        double r=0.03;
        double N=1;
        double sum;
        for (int i = 1; i <= years; i++) {
            N = (1 + r) * N;
        }
        sum = N * money;
        Assert.assertEquals(2427262,sum, 1.0);
    }
    @Test
    public void test2(){//測本金
         double N = 1, money;
         double sum=3000000;
         int years=30;
         double r=0.03;
         for (int i = 1; i <= years; i++) {
             N = (1 + r) * N;
         }
         money = sum / N;
         Assert.assertEquals(1235960,money, 1.0);
    }      

  不清楚究竟怎樣做，都是跟着同學的教導做的，不太明白

@Test
    public void test0() {//測單利終值
        double money=1000000.0;
        int years=30;
        double r=0.03;
        double sum;
        sum = money + money * years * r;
         Assert.assertEquals(1900000,sum, 1.0);
    }
    @Test
    public void test1(){//測複利終值
        double money=1000000.0;
        int years=30;
        double r=0.03;
        double N=1;
        double sum;
        for (int i = 1; i <= years; i++) {
            N = (1 + r) * N;
        }
        sum = N * money;
        Assert.assertEquals(2427262,sum, 1.0);
    }
    @Test
    public void test2(){//測本金
         double N = 1, money;
         double sum=3000000;
         int years=30;
         double r=0.03;
         for (int i = 1; i <= years; i++) {
             N = (1 + r) * N;
         }
         money = sum / N;
         Assert.assertEquals(1235960,money, 1.0);
    }