private final ReferenceQueue<Object> queue;

  // By preference, we will use the Thread constructor that has an `inheritThreadLocals` parameter.
  // But before Java 9, our only way not to inherit ThreadLocals is to zap them after the thread
  // is created, by accessing a private field.
  private static final @Nullable Constructor<Thread> bigThreadConstructor =
      getBigThreadConstructor();

/**
 * Test class for TransportException
 */
public class TransportExceptionTest {

    @Test
    @DisplayName("Test default constructor creates exception with null message")
    public void testDefaultConstructor() {
        // Create exception with default constructor
        TransportException exception = new TransportException();

        // Verify the exception is created and has no message

class Smb2ConstantsTest {

    @Test
    @DisplayName("Should have private constructor to prevent instantiation")
    void testPrivateConstructor() throws Exception {
        // Verify constructor is private
        Constructor<Smb2Constants> constructor = Smb2Constants.class.getDeclaredConstructor();
        assertTrue(Modifier.isPrivate(constructor.getModifiers()), "Constructor should be private");

    // Creates a minimal valid CIFS context that does not perform I/O by itself
    private CIFSContext ctx() {
        return SingletonContext.getInstance();
    }

    @Nested
    @DisplayName("Constructor behavior")
    class ConstructorTests {

        @ParameterizedTest
        @DisplayName("Accepts IPC$ URLs (happy path)")
        @ValueSource(strings = { "smb://server/IPC$/foo", "smb://server/IPC$/PIPE/foo" })

    @MethodSource("messages")
    @DisplayName("Message constructor preserves provided messages, including null/edge cases")
    void messageConstructor_preservesMessage(String msg) {
        // Arrange & Act
        SmbUnsupportedOperationException ex = new SmbUnsupportedOperationException(msg);

        // Assert
        assertEquals(msg, ex.getMessage(), "Constructor should preserve the provided message (including null)");

    @BeforeEach
    void setUp() {
        // Create mock objects for the constructor parameters
        aliasHandle = mock(SamrAliasHandle.class);
        sids = mock(LsarSidArray.class);
    }

    /**
     * Test method for {@link jcifs.dcerpc.msrpc.MsrpcGetMembersInAlias#MsrpcGetMembersInAlias(SamrAliasHandle, LsarSidArray)}.
     * Verifies that the constructor correctly initializes the object's fields using reflection for protected members.

            HMACT64 hmac = new HMACT64(TEST_KEY);
            hmac.engineReset();
            verify(mockMd5, times(2)).reset(); // Once in constructor, once in reset
            verify(mockMd5, times(2)).update(any(byte[].class)); // Once in constructor, once in reset
        }
    }

    @Test
    void testEngineGetDigestLength() throws NoSuchAlgorithmException {
        // Test engineGetDigestLength()

        assertEquals(blob.get().hashCode(), blob.hashCode(), "hashCode should delegate to internal array");
    }

    // Confirms constructor handles null by producing an empty buffer
    @Test
    @DisplayName("Constructor with null sets empty buffer")
    void constructor_withNull_setsEmpty() {
        // Arrange & Act
        SecurityBlob blob = new SecurityBlob(null);

        // Assert

        // We cannot directly access private fields of MsrpcSamrOpenAlias or its superclass
        // Instead, we verify the interaction with the DcerpcHandle and the return value.
        // The fact that the constructor completes without exception and sets 'opened' to true
        // implies the correct parameters were used internally.
    }

    @Test
    void constructor_shouldThrowSmbExceptionOnOpenFailure() throws IOException {

import jcifs.smb1.UniAddress;

/**
 * Unit tests for {@link NtlmChallenge}.
 */
class NtlmChallengeTest {

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

        @Test
        @DisplayName("Constructor sets fields correctly")
        void testConstructorSetsFields() {
            byte[] challenge = new byte[] { 1, 2, 3 };
            UniAddress dc = mock(UniAddress.class);