public void IsValidMutation_ComparesTwoWordsOfDifferentLength_ReturnsFalse()
        {
            var word1 = "A";
            var word2 = "BB";

            var wordChains = new WordChains(null);

            bool isValidMutation = wordChains.IsValidMutation(word1, word2);

            Assert.IsFalse(isValidMutation);
        }
        public void IsValidMutation_ComparesTwoMutableWordOfSameLength_ReturnsTrue()
        {
            var word1 = "AA";
            var word2 = "AB";

            var wordChains = new WordChains(null);

            bool isValidMutation = wordChains.IsValidMutation(word1, word2);

            Assert.IsTrue(isValidMutation);
        }