@SuppressWarnings("unused")
    private void dumpToFile(String path, String b) throws IOException {
        FileWriter f = new FileWriter(path);
        f.write(b);
        f.close();
    }
Object identity is used to differentiate between different implementation strategies, toString() is used to print a report.

@return an object with a descriptive toString() for the implementation under test
vespajlib/src/test/java/com/yahoo/text/JsonMicroBenchmarkTestCase.java