//Special
        try {   // IO Exception, expects test.in to be present
            BufferedReader reader = new BufferedReader(new FileReader("./test.in"));
            test = new Calc( new Scanner(reader));
            reader.close(); // whoops?
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        try {
            test.call();
            assert false;
        } catch (RuntimeException e) {
            assert "java.io.IOException: Stream closed".equals(e.getMessage()) : "msg: "+ e.getMessage();
        }