}

    /**
     * Test that Set lookup behavior is identical to original array-based lookup for facet fields.
     */
    @Test
    public void test_isFacetField_behaviourIdenticalToArrayLookup() {
        String[] fields = { "category", "type", "author" };
        queryFieldConfig.setFacetFields(fields);

        // Test positive cases
        for (String field : fields) {