public void IndexerTest()
        {
            int[]     quantity = { 2, 1, 0, 0, 0, 0, 0, 0 };
            SteelArea actual   = new SteelArea(quantity);

            Assert.AreEqual(2, actual[10].Quantity);
        }
        public void SteelAreaConstructorArrayTest()
        {
            int[]     quantity = { 2, 1, 0, 0, 0, 0, 0, 0 };
            SteelArea actual   = new SteelArea(quantity);

            Assert.AreEqual(2, actual[10].Quantity);
        }
        public void SteelAreaConstructorTest()
        {
            SteelArea actual = new SteelArea();

            Assert.AreEqual(0, actual[55].Quantity);
            Assert.AreEqual(0, actual[15].Quantity);
        }
        public void GetTotalAreaTest()
        {
            int[]     quantity = { 2, 1, 0, 0, 0, 0, 0, 0 };
            SteelArea test     = new SteelArea(quantity);

            double actual   = test.GetTotalArea();
            double expected = 400;

            Assert.AreEqual(expected, actual, 0.01);
        }