public void TrueForMultipleHyphenCase()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("six-year-old");
            bool           expected = true;

            Assert.Equal(actual, expected);
        }
        public void TrueForMultipleSpaceCase()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("virat kohly ");
            bool           expected = true;

            Assert.Equal(actual, expected);
        }
        public void TrueForMixedAlphabetCase()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("Alphabet");
            bool           expected = true;

            Assert.Equal(actual, expected);
        }
        public void TrueForHyphenCase()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("thumbscrew-japingly");
            bool           expected = true;

            Assert.Equal(actual, expected);
        }
        public void TrueForBigString()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("subdermatoglyphic");
            bool           expected = true;

            Assert.Equal(actual, expected);
        }
        public void FalseForEleven()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("eleven");
            bool           expected = false;

            Assert.Equal(actual, expected);
        }
        public void TrueForEmptyString()
        {
            IsogramChecker test     = new IsogramChecker();
            bool           actual   = test.CheckForIsogram("");
            bool           expected = true;

            Assert.Equal(actual, expected);
        }