private static final String KEY = "puppies";

  ConcurrentMap<String, AtomicInteger> backingMap;
  ConcurrentHashMultiset<String> multiset;

  @SuppressWarnings("unchecked")
  @Override
  protected void setUp() {
    backingMap = mock(ConcurrentMap.class);
    when(backingMap.isEmpty()).thenReturn(true);

    multiset = ConcurrentHashMultiset.create(backingMap);
  }

  public void testCount_elementPresent() {

    private SID mockSid2;

    @Mock
    private SID mockSid3;

    @Mock
    private SID mockDomainSid;

    private String testServerName;
    private SID[] testSids;

    @BeforeEach
    void setUp() {
        testServerName = "test-server.domain.com";
        testSids = new SID[] { mockSid1, mockSid2, mockSid3 };
    }

    // Test resolveSids with array
    @Test

 */
class TransPeekNamedPipeResponseTest {

    @Mock
    private Configuration mockConfig;

    private TransPeekNamedPipeResponse response;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        response = new TransPeekNamedPipeResponse(mockConfig);
    }

    @Test
    @DisplayName("Constructor should initialize TransPeekNamedPipeResponse")

/**
 * Test class for SmbOperationException
 */
@DisplayName("SmbOperationException Tests")
public class SmbOperationExceptionTest {

    private SmbOperationException exception;

    @BeforeEach
    void setUp() {
        exception = null;
    }

    @Test
    @DisplayName("Should create exception with error code and message")
    void testBasicCreation() {
        // When

class Smb2ReadResponseTest extends BaseTest {

    private Configuration mockConfig;
    private byte[] outputBuffer;
    private int outputBufferOffset;
    private Smb2ReadResponse response;

    @BeforeEach
    void setUp() {
        mockConfig = mock(Configuration.class);
        outputBuffer = new byte[1024];
        outputBufferOffset = 0;
        response = new Smb2ReadResponse(mockConfig, outputBuffer, outputBufferOffset);
    }

import jcifs.smb.SID;

/**
 * Test class for SecurityDescriptor
 */
class SecurityDescriptorTest {

    private SecurityDescriptor securityDescriptor;
    private byte[] testBuffer;

    @BeforeEach
    void setUp() {
        securityDescriptor = new SecurityDescriptor();
        testBuffer = new byte[1024];
    }

    @Test
    @DisplayName("Test default constructor creates empty SecurityDescriptor")

            addrEntry[addrIndex] = new NbtAddress(dummyName, 0, false, NbtAddress.B_NODE);
            return 6; // NbtAddress is 6 bytes
        }
    }

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        packet = new TestNameServicePacket(mockConfig);
        packet.questionName = mockQuestionName;
        packet.recordName = mockRecordName;
    }

    @Test

- **Java 21 features** - Switch expressions and pattern matching for reduced overhead

## 🧪 Building and Testing

### Development Setup
```bash
# Clone the repository
git clone https://github.com/codelibs/corelib.git
cd corelib

# Compile the project
mvn clean compile

# Run all tests
mvn test

# Run specific test class

    @Mock
    private SmbNegotiationRequest negotiationRequest;

    @Mock
    private CommonServerMessageBlock serverMessageBlock;

    @Mock
    private Response response;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
    }

    @Test
    @DisplayName("Test isValid returns true for valid negotiation")
    void testIsValidReturnsTrue() {
        // Arrange

import org.mockito.MockitoAnnotations;

/**
 * Test suite for DfsReferralResponseBuffer
 */
class DfsReferralResponseBufferTest {

    private DfsReferralResponseBuffer buffer;

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        buffer = new DfsReferralResponseBuffer();
    }

    @Nested
    @DisplayName("Constructor and Initial State Tests")
    class ConstructorTests {