public void AddPositionMethod_AddsItToPositionsProperty()
        {
            var positionList = new PositionListDataHolder(new PositionRepositoryStub());
            var dtoPosition  = new DTO.Position(1, "1", "1");

            positionList.AddPosition(dtoPosition);
            Assert.AreEqual(dtoPosition, positionList.Positions[0]);
        }