public void TextNavigator_IsPunctuation_1()
        {
            const string  text      = ".A,";
            TextNavigator navigator = new TextNavigator(text);

            Assert.IsTrue(navigator.IsPunctuation());
            navigator.ReadChar();
            Assert.IsFalse(navigator.IsPunctuation());
            navigator.ReadChar();
            Assert.IsTrue(navigator.IsPunctuation());
        }