return invocation.getArgument(1);
        });

        // When: Create iterator and close multiple times
        NetServerEnumIterator iterator = new NetServerEnumIterator(parent, treeHandle, "*", 0, null);

        iterator.close();
        iterator.close(); // Second close should be safe

        // Then: Tree handle should be released only once
        verify(treeHandle, times(1)).release();

   * CharStreams} method returns a singleton writer whose {@code close} method has no effect, while
   * the {@link Writer#nullWriter()} method returns a new instance whose methods throw after the
   * instance is {@link Writer#close() closed}.
   *
   * @since 15.0
   */
  public static Writer nullWriter() {
    return NullWriter.INSTANCE;
  }

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

        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);

- `org.codelibs.curl.io.ContentCache` and `ContentOutputStream`: internal utilities for streaming and caching.

Refer to the Javadoc for full API details.

## Building and Testing

```bash
git clone https://github.com/codelibs/curl4j.git
cd curl4j
mvn clean test
```

## License

        }

        @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();

                            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

   * any exceptions thrown when attempting to close a closeable will be suppressed. Otherwise, the
   * <i>first</i> exception to be thrown from an attempt to close a closeable will be thrown and any
   * additional exceptions that are thrown after that will be suppressed.
   */
  @Override
  public void close() throws IOException {
    Throwable throwable = thrown;

    // close closeables in LIFO order
    while (!stack.isEmpty()) {

    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);

        this.since = since;
    }

    /**
     * Creates a shallow copy of this parameter.
     */
    @Override
    public Parameter clone() {
        try {
            return (Parameter) super.clone();
        } catch (CloneNotSupportedException e) {
            throw new UnsupportedOperationException(e);
        }
    }