public void ItWorksOnSingletonList()
        {
            var input  = new[] { "coffee beans" };
            var output = new ListFormatter().Format(input);

            Assert.That("1. Coffee beans" == output[0]);
        }
        public void ItWorksOnAVeryLongList()
        {
            var size   = 100000;
            var input  = Enumerable.Range(1, size).Select(i => $"item{i}");
            var output = new ListFormatter().Format(input);

            Assert.AreEqual("100000. Item100000", output[size - 1]);
        }