private @Nullable Throwable thrown;

  @VisibleForTesting
  Closer(Suppressor suppressor) {
    this.suppressor = checkNotNull(suppressor); // checkNotNull to satisfy null tests
  }

  /**
   * Registers the given {@code closeable} to be closed when this {@code Closer} is {@linkplain
   * #close closed}.
   *
   * @return the given {@code closeable}
   */

    @Mock
    private Smb2WriteResponse mockWriteResponse;

    private SmbFileOutputStream outputStream;

    @BeforeEach
    void setUp() {
        // Common setup for most tests
        lenient().when(mockFileHandle.getTree()).thenReturn(mockTreeHandle);
        lenient().when(mockTreeHandle.getConfig()).thenReturn(mockConfig);
    }

    @Test

    }

    @Test
    public void testInvalidUncPath() throws Exception {
        // Due to normalization removing duplicate backslashes, true UNC validation doesn't work
        // These tests validate current behavior where problematic paths are caught by other checks

        // Test invalid server name with dots - caught by directory traversal check
        assertThrows(SmbException.class, () -> {

}

public boolean isWitnessServiceDiscovery() {
    return getBooleanProperty(WITNESS_SERVICE_DISCOVERY, true);
}
```

## 7. Testing Strategy

### 7.1 Unit Tests
```java
@Test
public void testWitnessRegistration() {
    WitnessRegistration registration = new WitnessRegistration(
        "\\\\server\\share", 
        InetAddress.getByName("192.168.1.100"),

import java.util.Map.Entry;
import java.util.Set;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullMarked;

/**
 * Tests for {@code EnumBiMap}.
 *
 * @author Mike Bostock
 * @author Jared Levy
 */
@J2ktIncompatible // EnumBimap
@GwtCompatible
@NullMarked
public class EnumBiMapTest extends TestCase {
  private enum Currency {

import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Tests for {@link Maps#transformValues} when the backing map's views have iterators that don't
 * support {@code remove()}.
 *
 * @author Jared Levy
 */
@GwtCompatible
@NullMarked

import jcifs.internal.CommonServerMessageBlockRequest;
import jcifs.internal.NotifyResponse;
import jcifs.internal.smb1.trans.nt.NtTransNotifyChange;
import jcifs.internal.smb2.notify.Smb2ChangeNotifyRequest;

/**
 * Tests for SmbWatchHandleImpl focusing on behavior and interactions.
 */
@ExtendWith(MockitoExtension.class)
class SmbWatchHandleImplTest {

    @Mock
    SmbFileHandleImpl handle;

    @Mock

import jcifs.internal.smb2.Smb2Constants;
import jcifs.internal.util.SMBUtil;

/**
 * Test class for Smb2TreeDisconnectRequest functionality
 */
@DisplayName("Smb2TreeDisconnectRequest Tests")
@ExtendWith(MockitoExtension.class)
class Smb2TreeDisconnectRequestTest {

    private static final short SMB2_TREE_DISCONNECT = 0x0004;

    @Test
    @DisplayName("Should create request with correct command type")

import jcifs.internal.smb2.ServerMessageBlock2Response;
import jcifs.internal.util.SMBUtil;

/**
 * Test class for Smb2TreeDisconnectResponse functionality
 */
@DisplayName("Smb2TreeDisconnectResponse Tests")
class Smb2TreeDisconnectResponseTest extends BaseTest {

    private Configuration mockConfig;
    private Smb2TreeDisconnectResponse response;

    @BeforeEach
    void setUp() {

import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import jcifs.CIFSContext;
import jcifs.Configuration;
import jcifs.smb.SmbFile;

/**
 * Integration tests for directory leasing functionality
 */
public class DirectoryLeasingIntegrationTest {

    @Mock
    private CIFSContext context;

    @Mock
    private Configuration config;

    @Mock