if len(p) == 0 {
		return 0, r.setErr(nil, false)
	}
	r.mu.Lock()
	defer r.mu.Unlock()
	if err := r.err; err != nil {
		if err == io.EOF {
			err = ErrWriteOnClosed
		}
		return 0, err
	}
	wrote := 0
	for len(p) > 0 {
		n, err = r.write(p)
		wrote += n
		if !r.block || err == nil {
			break
		}
		err = r.setErr(err, true)

func (s *Scanner) advance(n int) bool {
	if n < 0 {
		s.setErr(ErrNegativeAdvance)
		return false
	}
	if n > s.end-s.start {
		s.setErr(ErrAdvanceTooFar)
		return false
	}
	s.start += n
	return true
}

// setErr records the first error encountered.
func (s *Scanner) setErr(err error) {
	if s.err == nil || s.err == io.EOF {
		s.err = err
	}
}

        errContent = new ByteArrayOutputStream();
        System.setOut(new PrintStream(outContent));
        System.setErr(new PrintStream(errContent));
    }

    @AfterEach
    void restoreStreams() {
        System.setOut(originalOut);
        System.setErr(originalErr);
    }

    @Test
    @DisplayName("TestLocking fields are properly initialized")
    void testFieldInitialization() {

        // Reset LogStream instance using reflection
        resetLogStreamInstance();
    }

    @AfterEach
    void tearDown() throws Exception {
        // Restore original state
        System.setErr(originalErr);
        LogStream.level = originalLevel;
        // Reset instance using reflection
        resetLogStreamInstance();
    }

    private void resetLogStreamInstance() throws Exception {

	// Save listing...
	go func() {
		if err := saver.saveMetaCacheStream(listCtx, &meta, saveCh); err != nil {
			meta.setErr(err.Error())
		}
		cancel()
	}()

	// Do listing...
	go func(o listPathOptions) {
		err := z.listMerged(listCtx, o, inCh)
		if err != nil {
			meta.setErr(err.Error())
		}
		o.debugln("listAndSave: listing", o.ID, "finished with ", err)
	}(*o)

	cancel context.CancelFunc
}

func (m *metaCacheRPC) setErr(err string) {
	m.mu.Lock()
	defer m.mu.Unlock()
	meta := *m.meta
	if meta.status != scanStateError {
		meta.error = err
		meta.status = scanStateError
	} else {
		// An error is already set.
		return
	}
	meta, _ = m.o.updateMetacacheListing(meta, m.rpc)
	*m.meta = meta
}

// getErr will return an error if the listing failed.

            System.setOut(new PrintStream(outStream, true));
            final PrintStream originalErrStream = System.err;
            final ByteArrayOutputStream errStream = new ByteArrayOutputStream();
            System.setErr(new PrintStream(errStream, true));
            try {
                final String resourceName = params == null ? null : params.get(ExtractData.RESOURCE_NAME_KEY);

                .ifPresent(out -> System.setOut(out instanceof PrintStream pw ? pw : new PrintStream(out, true)));
        context.invokerRequest
                .stdErr()
                .ifPresent(err -> System.setErr(err instanceof PrintStream pw ? pw : new PrintStream(err, true)));
    }

    /**
     * Override this method to add some special handling for "raw streams" disabled option.
     */

        }

        try {
            if (stdout != null) {
                System.setOut(stdout);
            }
            if (stderr != null) {
                System.setErr(stderr);
            }

            CliRequest cliRequest = new CliRequest(args, classWorld);
            cliRequest.workingDirectory = workingDirectory;

            return doMain(cliRequest);

        // Test ID getter/setter
        AccessResultImpl<Long> result = new AccessResultImpl<>();

        result.setId(123L);
        assertEquals(Long.valueOf(123L), result.getId());

        result.setId(null);
        assertNull(result.getId());
    }

    public void test_sessionIdGetterSetter() {
        // Test session ID getter/setter