public void Constructor1ShouldStoreAndPrintValueAndSymbol()
        {
            WaterContent wc            = new WaterContent(.1);
            String       correctAnswer = "w = 10 %";

            Assert.AreEqual("w", wc.Symbol);
            Assert.AreEqual(wc.NumericValue, .1);
            Assert.AreEqual(correctAnswer, wc.ToString());
        }
        public void Constructor2ShouldStoreAndPrintValueAndSymbol()
        {
            WeightOfSolidMatter wsm = new WeightOfSolidMatter(10, WeightUnits.Kilograms);
            WeightOfWater       ww  = new WeightOfWater(10000, WeightUnits.Grams);
            WaterContent        wc  = new WaterContent(wsm, ww);
            String correctAnswer    = "w = 100 %";

            Assert.AreEqual("w", wc.Symbol);
            Assert.AreEqual(wc.NumericValue, 1);
            Assert.AreEqual(correctAnswer, wc.ToString());
        }