public override SyntaxNode     VisitDocumentationCommentTrivia(DocumentationCommentTriviaSyntax node)
    {
        string xml = node.GetText().ToString();
        var    TestEntryArgName = "__tst";

        char[] delim = { ' ', '\n', '\t', '\r' };
        var    ar    = xml.Split(delim, StringSplitOptions.RemoveEmptyEntries);

        if (ar.Length != 3 || ar[1] != "add")
        {
            return(base.VisitDocumentationCommentTrivia(node));
        }
        var lineToAdd  = TestEntryArgName + ".AddElement(" + ar[2] + ")";
        var expression = SyntaxFactory.ExpressionStatement(SyntaxFactory.ParseExpression(lineToAdd));

        return(expression);
    }