public void IsTodayXmasTest_假如今天不是聖誕節_應回傳Today_is_not_Xmas()
{
var holiday = new Holiday(DateTime.Now);
var expected = "Today is not Xmas";
var actual = holiday.IsTodayXmas();
Assert.AreEqual(expected, actual);
}
public void IsTodayXmasTest_假如今天是聖誕節_應回傳MerryXmas()
{
var holiday = new Holiday(new DateTime(2015,12,25));
var expected = "Merry Xmas!!";
var actual = holiday.IsTodayXmas();
// 請想辦法通過測試，今天是聖誕節的情境
Assert.AreEqual(expected, actual);
}