public void LoadHolidays_ReturnsTrue_ForDateAddedAsListItem()
{
//Arrange
HolidaysManager manager = new HolidaysManager();
List<DateTime> holidays = new List<DateTime>();
holidays.Add(new DateTime(2017, 5, 1));
holidays.Add(new DateTime(2017, 5, 3));
holidays.Add(new DateTime(2017, 11, 11));
DateTime checkedDate = new DateTime(2017, 5, 2);
//Act
manager.LoadHolidays(holidays);
//Assert
bool isHoliday = manager.IsHoliday(checkedDate);
Assert.IsFalse(isHoliday);
}