// Act & Assert
        NullPointerException npe = assertThrows(NullPointerException.class, () -> creds.unwrap(null));
        assertEquals("type", npe.getMessage());
    }

    @Test
    @DisplayName("clone returns a distinct copy with same properties")
    void clone_returns_copy() {
        // Arrange
        Subject subject = new Subject();

        assertEquals("MESSAGE", problem.getMessage());

        problem = new DefaultProblem(null, null, null, -1, -1, new Exception());
        assertEquals("", problem.getMessage());

        problem = new DefaultProblem(null, null, null, -1, -1, new Exception("EXCEPTION MESSAGE"));
        assertEquals("EXCEPTION MESSAGE", problem.getMessage());
    }

        } catch (NoSuchFieldException | IllegalAccessException e) {
            log.error("Failed to reset SingletonContext instance", e);
            fail("Failed to reset SingletonContext instance: " + e.getMessage());
        }
        // Clear system properties that might affect the test
        System.clearProperty("jcifs.properties");
        System.clearProperty("java.protocol.handler.pkgs");

        NullPointerException npe = assertThrows(NullPointerException.class, () -> locator.handleDFSReferral(referral, null));
        assertTrue(npe.getMessage() == null || npe.getMessage().contains("reqPath"));
        verify(locator).handleDFSReferral(referral, null);
        verifyNoMoreInteractions(locator);
    }

    void defaultConstructorSetsMessageAndStatus() {
        // Arrange & Act
        SmbEndOfFileException ex = new SmbEndOfFileException();

        // Assert
        assertEquals("Unexpectedly reached end of file", ex.getMessage(), "Default message must match");
        assertEquals(NtStatus.NT_STATUS_UNSUCCESSFUL, ex.getNtStatus(), "Default NT status should be UNSUCCESSFUL");
        assertNull(ex.getCause(), "Cause should be null by default");

    public void testSUnsupportedOperationExceptionString() {
        final ClUnsupportedOperationException clUnsupportedOperationException = new ClUnsupportedOperationException("hoge");
        assertThat(clUnsupportedOperationException.getMessage(), is("hoge"));
    }

    /**
     * Test method for
     * {@link org.codelibs.core.exception.ClUnsupportedOperationException#SUnsupportedOperationException(java.lang.String, java.lang.Throwable)}
     * .
     */

        // If logging fails, e.g. due to missing memory, at least try to log the
        // message and the cause for the failed logging.
        System.err.println(e.getMessage());
        System.err.println(errorInLogging.getMessage());
      } finally {
        runtime.exit(1);
      }
    }
  }

            fail("Should have thrown InvalidQueryException");
        } catch (InvalidQueryException e) {
            // Expected exception
            assertTrue(e.getMessage().contains("Unknown q:"));
            assertTrue(e.getMessage().contains("TermQuery"));
        }
    }

    public void test_execute_withNullQuery() {
        // Test that execute handles null query

        try {
            chain.update(user);
            fail("Expected exception to be thrown");
        } catch (RuntimeException e) {
            assertEquals("Update failed", e.getMessage());
        }

        assertEquals(1, chain.updateCalls.size());
    }

    // Test basic delete operation
    public void test_delete_normalUser() {

    }

    private static String getMessage(Throwable error, String def) {
        if (error == null) {
            return def;
        }
        String msg = error.getMessage();
        if (msg != null && !msg.isEmpty()) {
            return msg;
        }
        return getMessage(error.getCause(), def);
    }