public void BinarySearchTests_Class()
        {
            Note noteToSearch = new Note("3");

            Note[] arr      = new Note[] { noteToSearch, new Note("1"), new Note("2"), new Note("4"), new Note("5"), };
            int    expected = 0;
            var    actual   = arr.BinarySearch(noteToSearch);

            Assert.AreEqual(expected, actual);
        }