void testPasswordStoredAsCharArray() throws Exception {
        authenticator = new NtlmPasswordAuthenticator("DOMAIN", "username", "password123");

        // Use reflection to verify password is stored as char[]
        Field passwordField = NtlmPasswordAuthenticator.class.getDeclaredField("password");
        passwordField.setAccessible(true);
        Object passwordValue = passwordField.get(authenticator);

        assertTrue(region.hasAccess(RdmaAccess.LOCAL_READ), "Should have local read access");
        assertTrue(region.hasAccess(RdmaAccess.REMOTE_READ), "Should have remote read access");

        // Verify provider was called
        verify(mockProvider, atLeastOnce()).registerMemory(any(ByteBuffer.class), any());
    }

    @Test
    public void testReleaseSendRegion() throws Exception {

    @Override
    protected Iterator<T> newTargetIterator() {
      // make copy from master to verify later
      targetList = Lists.newArrayList(master);
      Iterator<T> iterator = targetList.iterator();
      return peekingIterator(iterator);
    }

    @Override
    protected void verify(List<T> elements) {
      // verify same objects were removed from reference and target
      assertEquals(elements, targetList);
    }
  }

import static org.mockito.Mockito.lenient;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.mockStatic;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import java.lang.reflect.Field;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.ietf.jgss.GSSContext;
import org.ietf.jgss.GSSCredential;

        it.close();

        // Verify interactions: one create, two additional directory queries (for fetchMore), one close
        verify(tree, times(1)).send(argThat((Request<?> r) -> r instanceof Smb2CreateRequest));
        verify(tree, times(2)).send(argThat((Request<?> r) -> r instanceof Smb2QueryDirectoryRequest));
        verify(tree, times(1)).send(argThat((Request<?> r) -> r instanceof Smb2CloseRequest));

        logger.info("Failure URL logs: {}", logs);
        assertTrue(logs.size() > 0, "Should have at least one failure URL log");

        // Verify response structure
        Integer status = JsonPath.from(response).get("response.status");
        assertEquals(0, status);

        // Verify log structure
        Map<String, Object> firstLog = logs.get(0);
        assertTrue(firstLog.containsKey("id"), "Log should have id field");

        for (Thread thread : threads) {
            thread.join();
        }

        // Verify no exceptions occurred
        for (int i = 0; i < threadCount; i++) {
            assertNull(exceptions[i], "Thread " + i + " threw exception");
        }

        // Verify all URLs were added
        synchronized (mockCallback) {

        AtomicInteger callbackCount = new AtomicInteger(0);

        try {
            // This will likely fail due to missing SearchEngineClient setup,
            // but we can verify the method signature and basic functionality
            SearchEngineUtil.scroll("test_index", hit -> {
                callbackCount.incrementAndGet();
                return true; // Continue processing
            });

        getMockRequest().setAttribute(Constants.FIELD_LOGS, new HashMap<String, List<String>>());
        queryContext = new QueryContext("test", true);
        assertEquals("test", queryContext.getQueryString());

        // Verify that highlighting and field log are initialized
        assertNotNull(getMockRequest().getAttribute(Constants.HIGHLIGHT_QUERIES));
        assertNotNull(getMockRequest().getAttribute(Constants.FIELD_LOGS));
    }

            } else {
                System.clearProperty(Constants.FESS_SEARCH_ENGINE_HTTP_ADDRESS);
            }
        }
    }

    @Test
    public void test_constructor_isPrivate() {
        // Verify that SystemUtil has a private constructor (utility class pattern)
        try {
            Constructor<SystemUtil> constructor = SystemUtil.class.getDeclaredConstructor();