void testTextualConstructorInvalid() {
            // Arrange
            String bad = "S-1"; // fewer than 3 tokens

            // Act + Assert
            SmbException ex = assertThrows(SmbException.class, () -> new SID(bad));
            assertTrue(ex.getMessage().contains("Bad textual SID format"));
        }

        @Test
        @DisplayName("Textual constructor null throws NullPointerException")

                            throw new SmbAuthException(NtStatus.NT_STATUS_LOGON_FAILURE);
                        }

                        if (ex != null) {
                            throw ex;
                        }

                        uid = response.uid;

                        if (request.digest != null) {

        when(handle.isValid()).thenReturn(false);
        SmbWatchHandleImpl sut = new SmbWatchHandleImpl(handle, 0, false);

        SmbException ex = assertThrows(SmbException.class, sut::watch, "Expected SmbException when handle invalid");
        assertTrue(ex.getMessage().contains("Watch was broken by tree disconnect"));
    }

    // Happy path for SMB2: a response is received and the list is returned; tree is closed
    @Test

        } catch (final InvocationTargetException ex) {
            final Throwable t = ex.getCause();
            if (t instanceof RuntimeException) {
                throw (RuntimeException) t;
            }
            if (t instanceof Error) {
                throw (Error) t;
            }
            throw new InvocationTargetRuntimeException(method.getDeclaringClass(), ex);
        } catch (final IllegalAccessException ex) {

                for (CircuitBreakerListener listener : listeners) {
                    try {
                        listener.onCallRejected(this);
                    } catch (Exception ex) {
                        log.warn("Listener threw exception", ex);
                    }
                }

                throw new CircuitOpenException("Circuit breaker '" + name + "' is open");
            }

    f.set("foo");
  }

  public void testExecutorSuccess() {
    CountingSameThreadExecutor ex = new CountingSameThreadExecutor();
    SettableFuture<String> f = SettableFuture.create();
    MockCallback callback = new MockCallback("foo");
    Futures.addCallback(f, callback, ex);
    f.set("foo");
    assertEquals(1, ex.runCount);
  }

  // Error cases
  public void testSameThreadExecutionException() {

        // Exception path
        when(treeConnection.hasCapability(999)).thenThrow(new SmbException("Not connected"));
        SmbException ex = assertThrows(SmbException.class, () -> handle.hasCapability(999));
        assertTrue(ex.getMessage().contains("Not connected"));
    }

    @Test
    @DisplayName("getTreeId delegates")
    void getTreeIdDelegates() {

        byte[] domain = {};
        if (domainStr != null) {
            try {
                domain = domainStr.getBytes(UNI_ENCODING);
            } catch (final IOException ex) {
                log.debug("Failed to get domain bytes", ex);
            }
        }
        final int domainLength = domain.length;
        byte[] server = {};
        final String host = tc.getNameServiceClient().getLocalHost().getHostName();

        void rejectsNonIpcShare(String url) {
            // Arrange & Act & Assert
            MalformedURLException ex =
                    assertThrows(MalformedURLException.class, () -> new SmbNamedPipe(url, SmbPipeResource.PIPE_TYPE_RDWR, ctx()));
            assertEquals("Named pipes are only valid on IPC$", ex.getMessage());
        }

        @Test
        @DisplayName("Null context throws NPE (invalid input)")

            // Act
            SMBProtocolDecodingException ex = assertThrows(SMBProtocolDecodingException.class, () -> resp.readBytesWireFormat(buffer, 0),
                    "Should throw when structure size != 4");

            // Assert: message is meaningful
            assertEquals("Structure size is not 4", ex.getMessage());
        }

        @Test