String input = "abcc";
LexerInterpreter lexEngine = g.createLexerInterpreter(new ANTLRInputStream(input));
CommonTokenStream stream = new CommonTokenStream(lexEngine);
stream.fill();
TokenStreamRewriter tokens = new TokenStreamRewriter(stream);
tokens.replace(2, 3, "foo");
tokens.insertBefore(1, "x");
String result = tokens.getText();
String expecting = "axbfoo";
assertEquals(expecting, result);
}