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 true;
        } catch (ClassNotFoundException e) {
            log.debug("DiSNI not available: {}", e.getMessage());
            return false;
        } catch (UnsatisfiedLinkError e) {
            log.debug("DiSNI native libraries not available: {}", e.getMessage());
            return false;
        }
    }

    @Override
    public Set<RdmaCapability> getSupportedCapabilities() {

        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.calculateMIC(data));
        assertTrue(ex.getMessage().contains("Failed to calculate MIC"));
    }

    @Test
    @DisplayName("calculateMIC with null data throws NPE")
    void calculateMIC_nullData() {

            } catch (final ChildUrlsException e) {
                connected = true;
                break;
            } catch (final Exception e) {
                logger.info("[{}] {}", i + 1, e.getMessage());
            }
            ThreadUtil.sleep(200L);
        }
        if (!connected) {
            throw new IllegalStateException("Could not connect to the Samba server");
        }
    }

        }, "A PACDecodingException should be thrown for a non-empty string with a zero pointer.");

        // Verify the exception message
        assertEquals("Non-empty string", exception.getMessage(), "The exception message is not correct.");
    }

    /**
     * Tests the {@link PacUnicodeString#check(String)} method with a string of incorrect length.
     */
    @Test

        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")

        final NullArgumentException nullArgumentException = new NullArgumentException("hoge");
        assertThat(nullArgumentException.getArgName(), is("hoge"));
        assertThat(nullArgumentException.getMessage(), is("[ECL0008]argument[hoge] is null."));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testErrorMessage_en() throws Exception {
        // ## Arrange ##

            // Then
            assertNotNull(result, "Should return exception for error result");
            assertEquals("DCERPC_BIND_ERR_ABSTRACT_SYNTAX_NOT_SUPPORTED", result.getMessage(),
                    "Should return correct error message for code 1");
        }

        @Test
        @DisplayName("getResult should return exception for error code 2")

            // 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 {