public void BackwardsFrom_TakeTwo_ReturnsTwoDates()
        {
            var startDate    = new DateTime(2010, 1, 2);
            var previousDate = startDate.AddDays(-1);

            var twoDaysBackwards = Days.BackwardsFrom(startDate)
                                   .Take(2);

            Expect(twoDaysBackwards, Is.EquivalentTo(new[] { startDate, previousDate }));
        }