public void GivenGallonAndLiters_ReturnAdditionInLiters() { double addTwo = compareVolume.AddTwoVolumesInLitres(Volume.Unit.GALLON, 1, Volume.Unit.LITRE, 3.78); double addTwoInch = 7.56; Assert.AreEqual(addTwoInch, addTwo, 0.0); }