public void PruebaFaltaNumeroGrande()
        {
            int[] arr  = { 1, 2, 3, 4, 6, 5, 7, 9, 8, 10, 11, 14, 13 };
            int   size = 14;

            Assert.AreEqual(12, EncontrarNumero.EncontarNumeroQueFlata(arr, size));
        }
        public void Hay0EnArreglo()
        {
            int[] arr  = { 2, 3, 4, 6, 5, 7, 0, 8, 10, 11, 12, 14, 13 };
            int   size = 14;

            try
            {
                EncontrarNumero.EncontarNumeroQueFlata(arr, size);
                Assert.Fail("An exception should have been thrown");
            }
            catch (ArgumentOutOfRangeException)
            {
                //success
            }
        }