String decoded = new String(BaseEncoding.base64().decode(encoded), StandardCharsets.UTF_8);

        assertEquals(emptyString, decoded);
    }

    public void test_facet_prefix_usage() {
        // Test that facet prefixes can be used correctly
        String fieldName = "category";
        String encodedFieldName = BaseEncoding.base64().encode(fieldName.getBytes(StandardCharsets.UTF_8));