try {
String testString = "test";
FileOutputStream stream = new FileOutputStream(fileName);
ReWriteVisitor visitor = new ReWriteVisitor(stream, "");
ConstNode node = new ConstNode(emptyPosition, testString);
node.accept(visitor);
visitor.flushStream();
stream.close();
BufferedReader reader = new BufferedReader(new FileReader(fileName));
assertEquals(reader.readLine(), testString);
reader.close();