@Test
    public void test_promiseChaining_returnsSamePromise() throws Exception {
        final Deferred<SuggestResponse> deferred = new Deferred<>();

        Deferred<SuggestResponse>.Promise promise1 = deferred.promise();
        Deferred<SuggestResponse>.Promise promise2 = promise1.then(response -> {});
        Deferred<SuggestResponse>.Promise promise3 = promise2.error(error -> {});

     * @return A Promise that will be resolved with the SuggestIndexResponse
     */
    public Deferred<SuggestIndexResponse>.Promise indexFromQueryLog(final ContentIndexingContext ctx, final QueryLogReader queryLogReader,
            final int docPerReq, final long requestInterval) {
        final Deferred<SuggestIndexResponse> deferred = new Deferred<>();
        threadPool.execute(() -> {
            final long start = System.currentTimeMillis();

            // Create a real NdrBuffer mock that can handle the deferred field access
            // But only test the non-deferred parts to avoid field mocking issues

            // When: Trying to encode (may throw exception due to deferred buffer)
            // Then: Should at least call the basic encoding methods before hitting deferred
            assertThrows(Exception.class, () -> {

        nb.index = idx;
        nb.deferred = deferred;
        return nb;
    }

    /**
     * Resets the buffer position to the start.
     */
    public void reset() {
        this.index = start;
        length = 0;
        deferred = this;
    }

    /**
     * Returns the current index position in the buffer.
     *
     * @return the current index
     */

    @Mock
    private NdrBuffer mockDeferredBuffer;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        // Set the deferred field directly since it's a public field, not a method
        mockNdrBuffer.deferred = mockDeferredBuffer;
        lenient().when(mockNdrBuffer.derive(anyInt())).thenReturn(mockDeferredBuffer);

        final NdrBuffer nb = new NdrBuffer(this.buf, this.start);
        nb.index = idx;
        nb.deferred = this.deferred;
        return nb;
    }

    /**
     * Resets the buffer position to the start.
     */
    public void reset() {
        this.index = this.start;
        this.length = 0;
        this.deferred = this;
    }

    /**
     * Returns the current index position in the buffer.
     *

                    deferred.reject(new SuggesterException("Search failure. Failed shards num:" + searchResponse.getFailedShards()));
                } else {
                    deferred.resolve(createResponse(searchResponse));
                }
            }

            @Override
            public void onFailure(final Exception e) {
                deferred.reject(new SuggesterException(e.getMessage(), e));

import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;

import org.codelibs.fess.suggest.Suggester;
import org.codelibs.fess.suggest.concurrent.Deferred;
import org.codelibs.fess.suggest.constants.SuggestConstants;
import org.codelibs.fess.suggest.entity.SuggestItem;
import org.codelibs.fess.suggest.exception.SuggestIndexException;

        assertEquals(0, derivedBuffer.start); // Derived buffer starts from the original buffer's start
        assertEquals(10, derivedBuffer.index);
        assertSame(ndrBuffer.deferred, derivedBuffer.deferred); // Deferred should be the same as original

        // Ensure changes to derived buffer don't affect original's index/start
        derivedBuffer.advance(5);
        assertEquals(15, derivedBuffer.index);

    }.also { expected ->
      assertThat(expected).hasMessage("timeout")
    }
  }

  /**
   * This test reproduces a crash where OkHttp attempted to use a deferred connection when the call
   * already had a healthy connection. It sets up a deferred connection by stalling the IPv6
   * connect, and it sets up a same-connection retry with [ErrorCode.REFUSED_STREAM].
   *
   * https://github.com/square/okhttp/pull/7190
   */