QueryRescorerBuilder queryRescorerBuilder = (QueryRescorerBuilder) result;
        assertEquals(testWindowSize, queryRescorerBuilder.windowSize().intValue());
    }

    public void test_evaluate_withNullParams() {
        // Test with null parameters - should throw NPE due to OpenSearch StoredLtrQueryBuilder requirements
        final String testModelName = "test_model";
        final int testWindowSize = 75;

public class QueryRescorerTest extends UnitFessTestCase {

    private QueryRescorer queryRescorer;

    @Override
    public void setUp() throws Exception {
        super.setUp();
    }

    public void test_evaluate_withNullParams() {
        // Test implementation that returns null
        queryRescorer = new QueryRescorer() {
            @Override
            public RescorerBuilder<?> evaluate(Map<String, Object> params) {