try {
                while (used == 0) {
                    lock.wait();
                }
            } catch (final InterruptedException ie) {
                throw new IOException(ie.getMessage());
            }
            result = pipe_buf[beg_idx] & 0xFF;
            beg_idx = (beg_idx + 1) % pipe_buf.length;
        }
        return result;
    }

    @Override

        SmbException ex =
                assertThrows(SmbException.class, () -> new DirFileEntryEnumIterator1(tree, parent, "*", (ResourceNameFilter) null, 0));
        assertTrue(ex.getMessage().contains("UNC must end with '\\'"), "Actual message: " + ex.getMessage());
        verify(tree, times(1)).acquire();
        verify(tree, times(1)).release();
    }

    @Test

        doThrow(new SmbException("capability check failed")).when(transport).hasCapability(eq(42));
        SmbException ex = assertThrows(SmbException.class, () -> transport.hasCapability(42));
        assertTrue(ex.getMessage().contains("failed"));
        verify(transport).hasCapability(42);
    }

    // Edge: disconnected status toggles
    @ParameterizedTest
    @DisplayName("isDisconnected reflects current mocked state")

        when(handle.ensureTreeConnected()).thenThrow(boom);

        // Act + Assert
        CIFSException ex = assertThrows(CIFSException.class, out::ensureTreeConnected);
        assertEquals("tree-fail", ex.getMessage());
        verify(handle, times(1)).ensureTreeConnected();
    }

    @Test
    @DisplayName("ensureOpen delegates and returns the file handle")
    void ensureOpen_delegatesAndReturns() throws Exception {

            return CANCELED;
        } catch (Exception e) {
            if (context.options().showErrors().orElse(false)) {
                context.logger.error(e.getMessage(), e);
            } else {
                context.logger.error(e.getMessage());
            }
            return ERROR;
        }
    }

    protected int badGoalsErrorMessage(String message, EncryptContext context) {

            return CANCELED;
        } catch (Exception e) {
            if (context.options().showErrors().orElse(false)) {
                context.logger.error(e.getMessage(), e);
            } else {
                context.logger.error(e.getMessage());
            }
            return ERROR;
        }
    }

    protected int badGoalsErrorMessage(String message, UpgradeContext context) {

        } catch (org.codelibs.core.exception.ResourceNotFoundRuntimeException e) {
            // Expected behavior
            assertTrue(e.getMessage().contains("dir") && e.getMessage().contains("file.conf"));
        }
    }

    @Test
    public void test_getClassesPath() {
        Path classesPath = ResourceUtil.getClassesPath("test.class");

        CIFSException ex1 = assertThrows(CIFSException.class, handle::getInput, "getInput after close must throw");
        assertTrue(ex1.getMessage().contains("Already closed"));
        CIFSException ex2 = assertThrows(CIFSException.class, handle::getOutput, "getOutput after close must throw");
        assertTrue(ex2.getMessage().contains("Already closed"));
    }

    @Test
    @DisplayName("ensureOpen opens SMB2 via UNC path and marks open")

        when(smbFile.isDirectory()).thenThrow(boom);

        // Act + Assert
        SmbException thrown = assertThrows(SmbException.class, () -> filter.accept(smbFile));
        assertEquals("io error", thrown.getMessage());
        verify(smbFile, times(1)).isDirectory();
        verifyNoMoreInteractions(smbFile);
    }

    @Test
    @DisplayName("accept: rejects null input with meaningful NullPointerException")

            // Only count specific exceptions as failures using custom predicate
            java.util.function.Predicate<Exception> isFailure = e -> e.getMessage() != null && e.getMessage().contains("critical");

            // Non-critical failures - should NOT open circuit
            for (int i = 0; i < 5; i++) {
                try {