public void whenPencilIsSharpenedLengthIsReducedByOne()
        {
            pencil = new Pencil(5, 1, 0);

            pencil.Write("aaaaa");
            pencil.Sharpen();

            Assert.AreEqual(0, pencil.getLength());
        }
        public void whenPencilLengthIsZeroPencilCannotBeSharpened()
        {
            pencil = new Pencil(5, 0, 0);

            pencil.Write("aaaaa");
            pencil.Sharpen();

            Assert.AreEqual("     ", pencil.Write("aaaaa"));
        }
        public void whenSharpenedDurabilityIsReset()
        {
            pencil.Write("fubdfniebibnasdA");

            pencil.Sharpen();

            Assert.AreEqual(100, pencil.getMaxDurability());
            Assert.AreEqual(100, pencil.getPointDurability());
        }