assertFalse(queryFieldConfig.isFacetField(""));
    }

    /**
     * Test that isSortField correctly handles null sortFieldSet.
     */
    @Test
    public void test_isSortField_withNullSet_returnsFalse() {
        queryFieldConfig.sortFieldSet = null;

        // Should return false, not throw NullPointerException
        assertFalse(queryFieldConfig.isSortField("anyfield"));

Shinsuke Sugaya <******@****.***> 1773442886 +0900