assertTrue(htmlTransformer.isSupportedCharset("EUC-JP"));
        assertTrue(htmlTransformer.isSupportedCharset("Shift_JIS"));
    }

    public void test_isSupportedCharset_invalid() {
        assertFalse(htmlTransformer.isSupportedCharset("aaa"));
        assertFalse(htmlTransformer.isSupportedCharset(" "));
        assertFalse(htmlTransformer.isSupportedCharset(null));
    }