val relay = edit(file, upstream, metadata, 1024)
    val source1 = relay.newSource()
    val source2 = relay.newSource()
    source1!!.close()
    source1.close() // Unnecessary. Shouldn't decrement the reference count.
    assertThat(relay.isClosed).isFalse()
    source2!!.close()
    assertThat(relay.isClosed).isTrue()
    assertFile(Relay.PREFIX_DIRTY, -1L, -1, null, null)
  }

  @Test
  fun racingReaders() {

  @Deprecated
  public static <V extends @Nullable Object> FluentFuture<V> from(FluentFuture<V> future) {
    return checkNotNull(future);
  }

  /**
   * Returns a {@code Future} whose result is taken from this {@code Future} or, if this {@code
   * Future} fails with the given {@code exceptionType}, from the result provided by the {@code

        doThrow(new CIFSException("Failed to close")).when(smbFileHandle).close(lastWriteTime);
        assertThrows(CIFSException.class, () -> smbFileHandle.close(lastWriteTime),
                "close(long) should throw CIFSException when closing fails.");
        verify(smbFileHandle, times(1)).close(lastWriteTime);
    }

    /**
     * Test close() successfully.
     *
     * @throws CIFSException
     */

        // Mock close success for the first call
        doAnswer(invocation -> {
            MsrpcSamrCloseHandle rpc = invocation.getArgument(0);
            rpc.retval = 0;
            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcSamrCloseHandle.class));

        // First close call
        aliasHandle.close();

        // Act: Call close again
        aliasHandle.close();

      return (long) data.length() * Long.SIZE;
    }

    /**
     * Number of set bits (1s).
     *
     * <p>Note that because of concurrent set calls and uses of atomics, this bitCount is a (very)
     * close *estimate* of the actual number of bits set. It's not possible to do better than an
     * estimate without locking. Note that the number, if not exactly accurate, is *always*
     * underestimating, never overestimating.
     */

				cleanUpFns: cFns,
			}
			return r, nil
		}
	}
	return fn, off, length, nil
}

// Close - calls the cleanup actions in reverse order
func (g *GetObjectReader) Close() error {
	if g == nil {
		return nil
	}
	// sync.Once is used here to ensure that Close() is
	// idempotent.
	g.once.Do(func() {
		for i := len(g.cleanUpFns) - 1; i >= 0; i-- {
			g.cleanUpFns[i]()
		}

          .url(server.url("/"))
          .build(),
      ).execute()
      .close()
    listener.removeUpToEvent<CallEnd>()
    val call =
      client.newCall(
        Request
          .Builder()
          .url(server.url("/"))
          .build(),
      )
    val response = call.execute()
    response.close()
    assertThat(listener.recordedEventTypes()).containsExactly(
      "CallStart",

    }

    /**
     * Test for close() method.
     * Verifies that the close method can be called without throwing an exception.
     * @throws CIFSException
     */
    @Test
    void testClose() throws CIFSException {
        smbTreeHandle.close();
        // Verify that close() was called on the mock
        verify(smbTreeHandle).close();
    }

    /**
     * Test for close() method throwing CIFSException.

    // Confirm all sent messages were received, followed by a client-initiated close.
    val server = serverListener.assertOpen()
    for (i in 0 until messageCount) {
      serverListener.assertBinaryMessage(message)
    }
    serverListener.assertClosing(1001, "")

    // When the server acknowledges the close the connection shuts down gracefully.
    server.close(1000, null)
    clientListener.assertClosing(1000, "")

     */
    @Test
    void testClose_multipleTimes() {
        doNothing().when(smbTree).close();

        smbTree.close();
        smbTree.close();
        smbTree.close();

        verify(smbTree, times(3)).close();
    }

    /**
     * Test for close() method throwing exception.
     * Verifies behavior when close throws an exception.
     */
    @Test
    void testClose_throwsException() {