}

    public void test_addContentSize_multiple() {
        DocList docList = new DocList();

        docList.addContentSize(100);
        assertEquals(100, docList.getContentSize());

        docList.addContentSize(200);
        assertEquals(300, docList.getContentSize());

        docList.addContentSize(50);
        assertEquals(350, docList.getContentSize());
    }

    public void test_addProcessingTime_multiple() {

        return contentSize;
    }

    /**
     * Adds to the total content size of this document list.
     *
     * @param contentSize the content size to add in bytes
     */
    public void addContentSize(final long contentSize) {
        this.contentSize += contentSize;
    }

    /**
     * Gets the total processing time for all documents in this list.
     *