public void GivenEmptyPhraseWhenLongestWordThenEmpty()
        {
            var result = new LongestWord().Execute("");

            Check.That(result).IsEqualTo("");
        }
        public void Given1WordOf2And1WordOf3WhenLongestWordThenReturnTheWordOf3()
        {
            var result = new LongestWord().Execute("I am young");

            Check.That(result).IsEqualTo("young");
        }