}

    /**
     * Sets the sort prefix used for identifying sort parameters in search queries.
     *
     * @param sortPrefix the sortPrefix to set
     */
    public void setSortPrefix(final String sortPrefix) {
        this.sortPrefix = sortPrefix;
    }

    /**
     * Gets the additional query string that is appended to all search queries.
     *
     * @return the additionalQuery

    @Test
    public void test_getSortPrefix() {
        assertEquals("sort:", queryHelper.getSortPrefix());
    }

    @Test
    public void test_setSortPrefix() {
        queryHelper.setSortPrefix("customSort:");
        assertEquals("customSort:", queryHelper.getSortPrefix());
    }

    @Test
    public void test_getAdditionalQuery() {
        assertNull(queryHelper.getAdditionalQuery());
    }