public void Item_RegisterForExternal_Works()
        {
            EquipmentItem sut = new EquipmentItem();

            sut.MakeExternalInstallsPermitted();

            ValidateFitPosition(sut, MountPoint.Forward);
            ValidateFitPosition(sut, MountPoint.Backward);
            ValidateFitPosition(sut, MountPoint.Nearside);
            ValidateFitPosition(sut, MountPoint.Offside);
        }