public void GroupByRevenueTest_get_groups_of_sum_of_revenue_per_4_items()
{
int[] revenueValues = new int[] { 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 };
GroupByCategory gbc = new GroupByCategory();
var result = gbc.GroupByRevenue(revenueValues);
int[] expected = new int[] { 50,66,60 };
CollectionAssert.AreEqual(expected, result);
}
public void GroupByCostTest_get_group_of_sum_of_cost_per_3_items()
{
//需求不是一個array放著 cost 的資料，而是一筆 product 身上有 cost, sellprice, revenue 等 property
//因此這樣的測試案例並沒有完整表達出來需求的context
int[] costValues = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
GroupByCategory gbc = new GroupByCategory();
//如果未來還要group by sellprice, 那麼gbc就得新增一個方法，這樣的擴充性是比較不足的
var result = gbc.GroupByCost(costValues);
int[] expected = new int[]{6, 15, 24, 21};
CollectionAssert.AreEqual(expected, result);
}