final long maxSegmentWeight;

    /**
     * The key reference queue contains entries whose keys have been garbage collected, and which
     * need to be cleaned up internally.
     */
    @CheckForNull final ReferenceQueue<K> keyReferenceQueue;

    /**
     * The value reference queue contains value references whose values have been garbage collected,
     * and which need to be cleaned up internally.

    assertThat(future.toString()).contains("[status=SUCCESS, result=[" + DATA1 + "]]");
  }

  public void testImmediateVoidFuture() throws Exception {
    ListenableFuture<@Nullable Void> voidFuture = immediateVoidFuture();

    assertThat(getDone(voidFuture)).isNull();
    assertThat(getDoneFromTimeoutOverload(voidFuture)).isNull();
    assertThat(voidFuture.toString()).contains("[status=SUCCESS, result=[null]]");
  }

    assertSame(valueOne, listener.getLastEvictedValue());
    assertTrue(map.removalNotificationQueue.isEmpty());
    assertFalse(segment.accessQueue.contains(entryOne));
    assertFalse(segment.writeQueue.contains(entryOne));
    assertEquals(0, segment.count);
    assertNull(table.get(0));
  }

  public void testRemoveEntryFromChain() {

    assertSame(valueOne, listener.getLastEvictedValue());
    assertTrue(map.removalNotificationQueue.isEmpty());
    assertFalse(segment.accessQueue.contains(entryOne));
    assertFalse(segment.writeQueue.contains(entryOne));
    assertEquals(0, segment.count);
    assertNull(table.get(0));
  }

  public void testRemoveEntryFromChain() {

   * @param o the object that might be contained in {@code c}
   * @return {@code true} if {@code c} contains {@code o}
   */
  static <K extends @Nullable Object, V extends @Nullable Object> boolean containsEntryImpl(
      Collection<Entry<K, V>> c, @CheckForNull Object o) {
    if (!(o instanceof Entry)) {
      return false;
    }
    return c.contains(unmodifiableEntry((Entry<?, ?>) o));
  }

  /**

    final long maxSegmentWeight;

    /**
     * The key reference queue contains entries whose keys have been garbage collected, and which
     * need to be cleaned up internally.
     */
    @CheckForNull final ReferenceQueue<K> keyReferenceQueue;

    /**
     * The value reference queue contains value references whose values have been garbage collected,
     * and which need to be cleaned up internally.

      }
    }
    return future;
  }

  /**
   * Marks this step as the last step in the {@code ClosingFuture} pipeline. When this step is done,
   * {@code receiver} will be called with an object that contains the result of the operation. The
   * receiver can store the {@link ValueAndCloser} outside the receiver for later synchronous use.
   *