assertFalse(auth.isClosed());

        // Close the authenticator
        auth.close();

        // Verify it's closed
        assertTrue(auth.isClosed());
        // Cannot check password after closing as it now throws IllegalStateException
        // This is actually good security practice - closed authenticators cannot be accessed

        // Verify multiple closes don't cause issues

        // Consume the only element
        assertTrue(it.hasNext());
        assertSame(fe1, it.next());
        // After exception path, iterator should be exhausted
        assertFalse(it.hasNext());

        // Closing should send a single Smb2CloseRequest
        it.close();
        verify(tree).send(argThat((Request<?> r) -> r instanceof Smb2CloseRequest));
    }

    @Test

    // TODO(cgdecker): Add CharSource.slice?
    StringBuilder builder = new StringBuilder();
    Reader reader = concatenated.openStream(); // no need to worry about closing
    for (int i = 0; i < 8; i++) {
      builder.append((char) reader.read());
    }
    assertEquals(expected, builder.toString());
  }

 * An HTTP response. Instances of this class are not immutable: the response body is a one-shot
 * value that may be consumed only once and then closed. All other properties are immutable.
 *
 * This class implements [Closeable]. Closing it simply closes its response body. See
 * [ResponseBody] for an explanation and examples.
 */
class Response internal constructor(
  /**

           * place as Closeables logs.
           */
          Closeables.logger.log(
              Level.WARNING, "Suppressing exception thrown when closing " + closeable, suppressed);
        }
      };

The connection lock is never held while doing I/O (even closing a socket) to prevent contention.

    // TODO(cgdecker): Add CharSource.slice?
    StringBuilder builder = new StringBuilder();
    Reader reader = concatenated.openStream(); // no need to worry about closing
    for (int i = 0; i < 8; i++) {
      builder.append((char) reader.read());
    }
    assertEquals(expected, builder.toString());
  }

        assertTrue(target.isStale());
    }

    @Test
    @DisplayName("getInput and getOutput throw after close")
    void testGetInputOutputAndClosed() throws CIFSException {
        // After closing the handle, further calls throw
        target.close();
        CIFSException e1 = assertThrows(SmbException.class, target::getInput);
        assertTrue(e1.getMessage().contains("Already closed"));

      val connectionPool = it.connectionPool

      connectionPool.evictAll()
      if (connectionPool.connectionCount() > 0) {
        // Minimise test flakiness due to possible race conditions with connections closing.
        // Some number of tests will report here, but not fail due to this delay.
        println("Delaying to avoid flakes")
        Thread.sleep(500L)
        println("After delay: " + connectionPool.connectionCount())

            throw new IOException("DiSNI RDMA write failed", e);
        }
    }

    @Override
    public void close() throws IOException {
        state = RdmaConnectionState.CLOSING;

        try {
            // In real implementation, this would close the DiSNI endpoint:
            // if (endpoint != null) {
            //     endpoint.close();
            // }
        } finally {