public void OutingsRepository_AddToCostList_ShouldIncreaseCountByOne()
        {
            Outings royalPin = new Outings(EventType.Bowling, 15, "6/23/2018", 23.00m, 345.0m);

            _totalCostList.AddToCostList(royalPin.TotalEventCost);

            var actual   = _totalCostList.GetDecimalList().Count;
            var expected = 1;

            Assert.AreEqual(expected, actual);
        }