}

    @Test
    public void test_calculateDocumentSize_withNullValue() {
        final Map<String, Object> docMap = new HashMap<>();
        docMap.put("id", "test");
        docMap.put("nullField", null);

        long size = indexingHelper.calculateDocumentSize(docMap);
        assertTrue(size > 0);
    }

        assertEquals("(content:\"value1\" OR content:\"value2\")", getQuery("", new String[0], multiFields, Collections.emptyMap(), false));

        final Map<String, String[]> nullFields = Collections.singletonMap("empty", null);
        assertEquals("", getQuery("", new String[0], nullFields, Collections.emptyMap(), false));
    }

    @Test
    public void test_sortField() {