* </p>
     *
     * @param closeable the closeable object
     * @see Closeable#close()
     */
    public static void close(final Closeable closeable) {
        if (closeable == null) {
            return;
        }
        try {

import jcifs.internal.smb2.ServerMessageBlock2Request;
import jcifs.internal.smb2.Smb2Constants;
import jcifs.internal.util.SMBUtil;
import jcifs.util.Hexdump;

/**
 * SMB2 Close request message. This command is used to close a file or directory
 * that was previously opened.
 *
 * @author mbechler
 *
 */
public class Smb2CloseRequest extends ServerMessageBlock2Request<Smb2CloseResponse> implements RequestWithFileId {

        }

        @Test
        @DisplayName("Should close pool with active transports")
        void testClosePoolWithActiveTransports() throws CIFSException {
            // Given
            when(transportPool.close()).thenReturn(true);

            // When
            boolean result = transportPool.close();

            // Then
            assertTrue(result);
            verify(transportPool).close();

        TestIterator iterator = new TestIterator(null);
        iterator.close();

        verify(delegate).close();
    }

    @Test
    @DisplayName("Close propagates exception")
    void closeException() throws CIFSException {
        when(delegate.hasNext()).thenReturn(false);
        doThrow(new CIFSException("Close failed")).when(delegate).close();

        TestIterator iterator = new TestIterator(null);

                            timingRatio, TIMING_TOLERANCE, timeStart, timeMiddle, timeEnd));
        } finally {
            // Clean up resources
            baseAuth.close();
            startAuth.close();
            middleAuth.close();
            endAuth.close();
        }
    }

    /**
     * Test constant-time comparison with various password lengths.
     */
    @Test

        }
    }

    @Test
    @DisplayName("EmptyIterator should handle close operations multiple times")
    void testMultipleCloseOperations() {
        // When & Then
        assertDoesNotThrow(() -> {
            try {
                emptyIterator.close();
                emptyIterator.close();
                emptyIterator.close();
            } catch (CIFSException e) {
                throw new RuntimeException(e);

    void testClose_True() throws CIFSException {
        // Test close() method when true
        when(mockDelegate.close()).thenReturn(true);
        assertTrue(cifsContextWrapper.close());
        verify(mockDelegate).close();
    }

    @Test
    void testClose_False() throws CIFSException {
        // Test close() method when false
        when(mockDelegate.close()).thenReturn(false);

            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcLsarClose.class));

        // Close once
        handle.close();

        // Act
        // Try to close again
        handle.close();

        // Assert
        // Verify sendrecv was called once for open and only once for close
        verify(mockDcerpcHandle, times(1)).sendrecv(any(MsrpcLsarOpenPolicy2.class));

  }

  public void testNullCloseable() throws IOException {
    Closer closer = Closer.create();
    closer.register(null);
    closer.close();
  }

  /**
   * Asserts that an exception was thrown when trying to close each of the given throwables and that
   * each such exception was suppressed because of the given thrown exception.
   */
  private void assertSuppressed(Suppression... expected) {

        // Test that multiple close() calls are all ignored
        byte[] data = "Test data".getBytes();
        ByteArrayInputStream underlyingStream = new ByteArrayInputStream(data);
        IgnoreCloseInputStream stream = new IgnoreCloseInputStream(underlyingStream);

        // Multiple close calls should all be ignored
        stream.close();
        stream.close();
        stream.close();