"B : 'b';\n" +
"C : 'c';\n");
CharStream input = new ANTLRStringStream("abcba");
Interpreter lexEngine = new Interpreter(g, input);
TokenRewriteStream tokens = new TokenRewriteStream(lexEngine);
tokens.fill();
tokens.replace(2, 2, "xyz");
tokens.replace(0, 3, "foo");
String result = tokens.toString();
String expecting = "fooa";
assertEquals(expecting, result);