public void GetChristmasDayTest()
{
// arrange
var expected = DateTime.Parse("12/25/2020");
// act
var actual = SpecialDateHelper.GetChristmasDay("2020");
// assert
Assert.Equal(expected, actual);
}
public void GetDateCustomTests()
{
// arrange
var holiday = new PaidHoliday(
"Jason's Birthday",
(string year) => SpecialDateHelper.GetChristmasDay(year).AddDays(-4));
var expected = DateTime.Parse("12/21/2020");
// act
var actual = holiday.GetDate("2020");
// assert
Assert.Equal(expected, actual);
}