private static final String TEST_SERVER = "server";
    private static final String TEST_ENDPOINT = "\\pipe\\test";

    @BeforeEach
    void setUp() throws IOException {
        // Setup mock behavior with lenient stubbing to avoid UnnecessaryStubbingException
        lenient().when(mockSmbNamedPipe.openPipe()).thenReturn(mockSmbPipeHandle);

    void setUp() throws Exception {
        witnessServer = InetAddress.getByName("192.168.1.200");
        serverAddress = InetAddress.getByName("192.168.1.100");

        // Setup mock configuration with lenient stubbing
        lenient().when(mockContext.getConfig()).thenReturn(mockConfig);
        lenient().when(mockConfig.getWitnessHeartbeatTimeout()).thenReturn(120000L);

    @BeforeEach
    void setUp() throws Exception {
        mockService = new MockWitnessService();
        mockService.start();

        // Setup mock configuration with lenient stubbing
        lenient().when(mockContext.getConfig()).thenReturn(mockConfig);
        lenient().when(mockConfig.isUseWitness()).thenReturn(true);
        lenient().when(mockConfig.getWitnessHeartbeatTimeout()).thenReturn(120000L);

            // These methods do not throw and allow interaction checks.
            tc.getConfig();
            tc.getCredentials();

            // Minimal behavior: return a mock SSPContext with lenient stubbing
            SSPContext ctx = mock(SSPContext.class);
            lenient().when(ctx.isEstablished()).thenReturn(false);
            return ctx;
        }

        @Override
        public Subject getSubject() {

        FileEntry e = null;
        // Act & Assert: demonstrate invalid usage results in NPE
        assertThrows(NullPointerException.class, () -> e.getName());
    }

    @Nested
    @DisplayName("Mockito stubbing for edge cases")
    class MockitoEdgeCases {
        @Test
        @DisplayName("getName can return null and empty strings via mock")
        void mock_nameEdgeValues() {
            // Arrange

    @Test
    @DisplayName("renew: invokes getSubject and returns self")
    void testRenewInvokesGetSubjectAndReturnsSelf() {
        JAASAuthenticator auth = spy(new JAASAuthenticator());
        // Avoid real JAAS by stubbing getSubject
        doReturn(new Subject()).when(auth).getSubject();

        // Act
        CredentialsInternal result = auth.renew();

        // Assert interaction and return value

    @Mock
    private NameServiceClient mockNameServiceClient;

    @Mock
    private NetbiosAddress mockLocalHost;

    @BeforeEach
    void setUp() {
        // Setup mock context with lenient stubbing to avoid UnnecessaryStubbingException
        lenient().when(mockContext.getConfig()).thenReturn(mockConfig);
        lenient().when(mockContext.getNameServiceClient()).thenReturn(mockNameServiceClient);

            }
        }
    }

    @BeforeEach
    void setup() throws MalformedURLException, CIFSException {
        // Common happy-path defaults
        // Use lenient() to avoid strict stubbing issues with Mockito
        lenient().when(tree.acquire()).thenReturn(tree);
        lenient().when(tree.getConfig()).thenReturn(config);
        lenient().when(config.getListCount()).thenReturn(10);

    @Mock
    private NbtAddress mockQueryAddress;

    private NodeStatusResponse response;

    @BeforeEach
    void setUp() throws Exception {
        // Setup mock configuration with lenient stubbing
        lenient().when(mockConfig.getOemEncoding()).thenReturn("UTF-8");

        // Setup mock query address
        mockQueryAddress = mock(NbtAddress.class);

    void setUp() {
        mockConfig = mock(Configuration.class);
        mockContext = mock(CIFSContext.class);
        testFileId = new byte[16];
        Arrays.fill(testFileId, (byte) 0xAB);

        // Use lenient stubbing for default configuration values
        lenient().when(mockConfig.getNotifyBufferSize()).thenReturn(8192);
        lenient().when(mockContext.getConfig()).thenReturn(mockConfig);