enc = "S-JIS";
        assertEquals("S-JIS", encodingHelper.normalize(enc));
    }

    public void test_normalize_map() {
        String enc;

        encodingHelper.addEncodingMapping("S-JIS", "Shift_JIS");

        enc = "UTF-8";
        assertEquals("UTF-8", encodingHelper.normalize(enc));

        enc = "Shift_JIS";
        assertEquals("Shift_JIS", encodingHelper.normalize(enc));

            return enc;
        }
        return newEnc;
    }

    public void setDefaultEncoding(final String defaultEncoding) {
        this.defaultEncoding = defaultEncoding;
    }

    public void addEncodingMapping(final String source, final String target) {
        encodingMap.put(toLowerCase(source), target);
    }

    protected String toLowerCase(final String enc) {
        return enc.toLowerCase(Locale.ROOT);
    }