hash = "";
        value = "";
        assertEquals(hash, documentHelper.decodeSimilarDocHash(value));

        assertNull(documentHelper.decodeSimilarDocHash(null));
    }

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

        assertEquals("", documentHelper.appendLineNumber("L", null));
        assertEquals("", documentHelper.appendLineNumber("L", ""));