message.setTimestamp(timestamp);
        message.setSources(sources);

        assertEquals("msg-123", message.getId());
        assertEquals("assistant", message.getRole());
        assertEquals("Test content", message.getContent());
        assertEquals(timestamp, message.getTimestamp());
        assertSame(sources, message.getSources());
    }

    @Test
    public void test_addSource() {

                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsFailedToUploadMappingFile(GLOBAL),
                        () -> redirectWith(getClass(), moreUrl("uploadpage/" + form.dictId)));
            }
            saveInfo(messages -> messages.addSuccessUploadMappingFile(GLOBAL));

                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsFailedToUploadStemmeroverrideFile(GLOBAL),
                        () -> redirectWith(getClass(), moreUrl("uploadpage/" + form.dictId)));
            }
            saveInfo(messages -> messages.addSuccessUploadStemmeroverrideFile(GLOBAL));

    @Test
    public void test_constructorWithMessage() {
        // Test constructor with message only
        String message = "Thumbnail generation failed";
        ThumbnailGenerationException exception = new ThumbnailGenerationException(message);

        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test

    private static final long serialVersionUID = 1L;

    /**
     * Constructor.
     * @param message The exception message.
     */
    public ResultOffsetExceededException(final String message) {
        super(message);
    }

        validateApi(body, messages -> {});
        body.crudMode = CrudMode.CREATE;
        final StemmerOverrideItem entity = createStemmerOverrideItem(this, body, () -> {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));
            return null;
        }).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));

                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }
        }).orElse(() -> {
            throwValidationError(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL), this::asEditHtml);
        });
        return redirect(getClass());
    }

    /**

                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }
        }).orElse(() -> {
            throwValidationError(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL), this::asEditHtml);
        });
        return redirect(getClass());
    }

        validateApi(body, messages -> {});
        body.crudMode = CrudMode.CREATE;
        final CharMappingItem entity = createCharMappingItem(this, body, () -> {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));
            return null;
        }).orElseGet(() -> {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL));

                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }
        }).orElse(() -> {
            throwValidationError(messages -> messages.addErrorsCrudFailedToCreateInstance(GLOBAL), this::asEditHtml);
        });
        return redirect(getClass());
    }

    /**