return mockResource1;
            }
        };

        // When/Then
        assertTrue(iterator.hasNext(), "Should have first element");
        SmbResource first = iterator.next();
        assertNotNull(first, "First element should not be null");
        assertEquals("file1.txt", first.getName());

        assertTrue(iterator.hasNext(), "Should have second element");
        SmbResource second = iterator.next();

/**
 * A tuple of three values.
 *
 * @author koichik
 * @param <T1>
 *            The type of the first value
 * @param <T2>
 *            The type of the second value
 * @param <T3>
 *            The type of the third value
 */
public class Tuple3<T1, T2, T3> {

    /** The first value */
    protected T1 value1;

    /** The second value */
    protected T2 value2;

    /** The third value */

        return header.previous;
    }

    /**
     * Removes the first element.
     *
     * @return the first element
     */
    public E removeFirst() {
        if (isEmpty()) {
            throw new NoSuchElementException();
        }
        final E first = header.next.element;
        header.next.remove();
        return first;
    }

    /**
     * Removes the last element.
     *

        // Should alternate between channels
        ChannelInfo first = loadBalancer.selectChannel(mockMessage);
        ChannelInfo second = loadBalancer.selectChannel(mockMessage);

        assertNotNull(first);
        assertNotNull(second);
        // Due to round-robin, should get different channels or same order
        assertTrue(Arrays.asList(channel1, channel2).contains(first));

        String result = StringUtil.join(null, "first", "second", "third");
        assertEquals("firstnullsecondnullthird", result);
    }

    @Test
    @DisplayName("Should handle null elements in array")
    void testJoinWithNullElements() {
        String result = StringUtil.join(",", "first", null, "third");
        assertEquals("first,null,third", result);
    }

    @Test

        NetServerFileEntryAdapterIterator itr = new NetServerFileEntryAdapterIterator(parent, delegate, null);

        // Act & Assert
        assertTrue(itr.hasNext(), "Should have first element ready");
        SmbResource r1 = itr.next();
        assertNotNull(r1, "First adapted resource must not be null");
        // For workgroup/server entries, names end with '/'
        assertTrue(r1.getName().endsWith("/"), "Name should end with '/'");

     * NDR syntax UUID for DCE/RPC protocol
     */
    UUID DCERPC_UUID_SYNTAX_NDR = new UUID("8a885d04-1ceb-11c9-9fe8-08002b104860");

    /**
     * First fragment flag - indicates first fragment of a multi-fragment message
     */
    int DCERPC_FIRST_FRAG = 0x01; /* First fragment */
    /**
     * Last fragment flag - indicates last fragment of a multi-fragment message
     */
    int DCERPC_LAST_FRAG = 0x02; /* Last fragment */

    void testNextElementFirstCall() {
        Object element = transaction.nextElement();
        assertSame(transaction, element, "First nextElement should return the transaction itself");
    }

    @Test
    @DisplayName("Test nextElement() changes command on second call")
    void testNextElementSecondCall() {
        // First call - primary

    /** Maximum number of rows to extract. */
    protected int maxRows = 10000;

    /** Delimiter character for CSV parsing. */
    protected Character delimiter = null;

    /** Whether the first row contains headers. */
    protected boolean hasHeader = true;

    /** Whether to auto-detect the delimiter. */
    protected boolean autoDetectDelimiter = true;

    /** Whether to extract column names as metadata. */

    void iteratesAndFetchesMoreThenCloses() throws Exception {
        // Arrange: program send() to simulate first, next, next(NO_MORE_FILES)
        List<String[]> batches = new ArrayList<>();
        batches.add(new String[] { ".", "..", "a", "b" }); // first batch, dot entries filtered
        batches.add(new String[] { "c" }); // second batch
        batches.add(new String[] {}); // last -> NO_MORE_FILES