public void OutingRepository_GetTotalCost_ShouldReturnTotalCost() { //Arrange List <Outings> outingsList = _outingsRepository.GetOutingsList(); Outings outings = new Outings(); outings.TotalCostEvent = 1000m; _outingsRepository.AddOutingsToList(outings); Outings outingsTwo = new Outings(); outingsTwo.TotalCostEvent = 500m; _outingsRepository.AddOutingsToList(outingsTwo); Outings outingsThree = new Outings(); outingsThree.TotalCostEvent = 250m; _outingsRepository.AddOutingsToList(outingsThree); //Act decimal actual = _outingsRepository.GetTotalCost(); decimal expected = 1750m; //Assert Assert.AreEqual(expected, actual); }