public void SimpleTextTest1()
        {
            T9Engine t9engine = new T9Engine();

            string input  = "hi";
            string output = "44 444";

            string result = t9engine.TextToNumber(input);

            Assert.AreEqual(result, output);
        }
        public void EmptyStringTest1()
        {
            T9Engine t9engine = new T9Engine();

            string input  = "";
            string output = "";

            string result = t9engine.TextToNumber(input);

            Assert.AreEqual(result, output);
        }
        public void SimpleTextTest3()
        {
            T9Engine t9engine = new T9Engine();

            string input  = "foo  bar";
            string output = "333666 6660 022 2777";

            string result = t9engine.TextToNumber(input);

            Assert.AreEqual(result, output);
        }
        public void SimpleTextTest4()
        {
            T9Engine t9engine = new T9Engine();

            string input  = "hello world";
            string output = "4433555 555666096667775553";

            string result = t9engine.TextToNumber(input);

            Assert.AreEqual(result, output);
        }
        public void SimpleTextTest2()
        {
            T9Engine t9engine = new T9Engine();

            string input  = "yes";
            string output = "999337777";

            string result = t9engine.TextToNumber(input);

            Assert.AreEqual(result, output);
        }