public void CommonCharacters_Test6()
        {
            var instance = new CommonCharactersProblem();
            var input    = new List <string>();
            var expected = new List <char>();

            var actual = instance.Solve(input);

            expected.Sort();
            actual.Sort();
            Assert.AreEqual(expected, actual);
        }
        public void CommonCharacters_Test1()
        {
            var instance = new CommonCharactersProblem();
            var input    = new List <string>()
            {
                "google", "facebook", "youtube"
            };
            var expected = new List <char>()
            {
                'e', 'o'
            };

            var actual = instance.Solve(input);

            expected.Sort();
            actual.Sort();
            Assert.AreEqual(expected, actual);
        }