void MethodThatThrows()
 {
     PalidromeEquality.IsPalindrome(null);
 }
        public void test_empty_word()
        {
            var result = PalidromeEquality.IsPalindrome(string.Empty);

            Assert.IsTrue(result);
        }
        public void test_numbers()
        {
            var result = PalidromeEquality.IsPalindrome("1221");

            Assert.IsTrue(result);
        }
        public void test_is_valid_word()
        {
            var result = PalidromeEquality.IsPalindrome("level");

            Assert.IsTrue(result);
        }