public IEnumerable <AvailableDeliveryDate> GenerateAvailableDeliveryDates(int postalCode,
                                                                           IEnumerable <int> daysToDelivery) => daysToDelivery.Select(days => _timeProvider.GetToday().AddDays(days)).Select(date => new AvailableDeliveryDate()
 {
     DeliveryDate    = date,
     IsGreenDelivery = GreenDatesProvider.IsDateGreen(date),
     PostalCode      = postalCode
 });
        public void IsGreenMethodShouldReturnTrueOnlyForWednesdays(string givenDate, bool expectedResult)
        {
            var date = DateTime.Parse(givenDate);

            Assert.AreEqual(GreenDatesProvider.IsDateGreen(date), expectedResult);
        }