value = "$H4sIAAAAAAAAAAMAAAAAAAAAAAA";
        assertEquals(value, documentHelper.encodeSimilarDocHash(hash));

        assertNull(documentHelper.encodeSimilarDocHash(null));
    }

    public void test_decodeSimilarDocHash() {
        DocumentHelper documentHelper = new DocumentHelper();

        String hash = "01010101010101010101010101010101";
        String value = "$H4sIAAAAAAAAADMwNMALAXC7sg0gAAAA";