assertEquals(null, result, "Should return null when type cannot be unwrapped");
        verify(smbTree).unwrap(CustomSmbTree.class);
    }

    /**
     * Test for unwrap() method throwing exception.
     * Verifies that unwrap can throw exceptions when appropriate.
     */
    @Test
    void testUnwrap_throwsException() {

        // Both resources should be closed
        verify(filter, times(2)).accept(resource);
        verify(resource, times(2)).close();
    }

    @Test
    @DisplayName("Iterator with filter throwing exception")
    void iteratorWithFilterException() throws Exception {
        // Setup: first attempt throws, second succeeds
        FileEntry entry1 = mock(FileEntry.class);

     * Verify that all methods can be called with null buffers without
     * throwing exceptions. This test ensures robustness of the implementation.
     */
    @Test
    void methodsHandleNullBuffersGracefully() {
        // Arrange
        TransWaitNamedPipeResponse resp = new TransWaitNamedPipeResponse();
        // Act & Assert - no exceptions should be thrown
        assertDoesNotThrow(() -> resp.writeSetupWireFormat(null, 0));

        StackTraceElement firstElement = stackTrace[0];
        assertEquals(this.getClass().getName(), firstElement.getClassName());
    }

    public void test_throwAndCatch() {
        // Test throwing and catching the exception
        String username = "nonexistentuser";

        try {
            throw new FessUserNotFoundException(username);
        } catch (FessUserNotFoundException e) {

        int securityInfo = OWNER_SECURITY_INFORMATION;

        querySecurityDesc = new NtTransQuerySecurityDesc(mockConfig, fid, securityInfo);

        // Constructor should initialize the object without throwing exceptions
        assertNotNull(querySecurityDesc);

        // Test toString contains the expected values to verify field initialization
        String str = querySecurityDesc.toString();

        ?: listOf()

  fun shutdownInput() {
    javaNetSocket.shutdownInput()
  }

  fun shutdownOutput() {
    javaNetSocket.shutdownOutput()
  }

  /** Sleeps [nanos], throwing if the socket is closed before that period has elapsed. */
  fun sleepWhileOpen(nanos: Long) {
    var ms = nanos / 1_000_000L
    val ns = nanos - (ms * 1_000_000L)

    while (ms > 100) {
      Thread.sleep(100)

    shouldFail(new FailOneArgDoesntThrowNpe());
  }

  private static class FailOneArgThrowsWrongType extends PassObject {
    @Override
    public void oneArg(String s) {
      doThrow(s); // Fail: throwing non-NPE exception for null s
    }
  }

  public void testFailOneArgThrowsWrongType() {
    shouldFail(new FailOneArgThrowsWrongType());
  }

        // Assert throwing/catching behavior with assertThrows
        SMBProtocolDecodingException thrown = assertThrows(SMBProtocolDecodingException.class, () -> {
            throw new SMBProtocolDecodingException();
        }, "Should be throwable via assertThrows");
        assertTrue(thrown instanceof CIFSException, "Thrown instance should also be CIFSException subtype");
    }

        // Then
        assertNotNull(ex);
        assertEquals(message, ex.getMessage());
        assertEquals(cause, ex.getCause());
    }

    @Test
    @DisplayName("Should handle null message and/or cause without throwing")
    void testNullInputs() {
        assertDoesNotThrow(() -> {
            SpnegoException ex1 = new SpnegoException((String) null);
            assertNotNull(ex1);
            assertNull(ex1.getMessage());

    }

    @Test
    @DisplayName("Test all write methods with null buffer")
    void testWriteMethodsWithNullBuffer() {
        // Even with null buffer, methods should return 0 without throwing exception
        int result = response.writeSetupWireFormat(null, 0);
        assertEquals(0, result);

        result = response.writeParametersWireFormat(null, 0);
        assertEquals(0, result);