Is it possible to verify that some fields, for example, of the DTO object is not “affected” during unit testing?
Example:
Imagine we have some DTO to sent via rest:

public class CallbackDTO {
    private Long                  id;
    private String                status;
    private Long                  checkPointId;
    private List<CallbackDetails> details;
    private OffsetDateTime        sysdate;
    // getters and setters
}
class CallbackDetails {
    private String              propertyName;
    private String              propertyValue;
    private Map<String, String> additionalProperties;
    // getters and setters
}

And i have some code that sends a two diffrent “callbacks”:

public class CallbackSender {
    public CallbackDTO sendCallbackToOneSystem() {
        var callback = new CallbackDTO();
        callback.setId(1L);
        callback.setStatus("NEW");
        return callback;
    }
    public CallbackDTO sendCallbackToAnotherSystem() {
        var callback = new CallbackDTO();
        callback.setId(2L);
        callback.setStatus("FINISHED");
        callback.setSysdate(OffsetDateTime.now());
        callback.setCheckPointId(1L);
        callback.setDetails(
            List.of(
                new CallbackDetails()
                    .setPropertyName("some-property")
                    .setPropertyValue("some-value")
                    .setAdditionalProperties(
                        Map.of(
                            "request-id", UUID.randomUUID().toString(),
                            "correlation-header-name", "x-correlation-id",
                            "correlation-header-ref", "request-id"
                        )
                    )
            )
        );
        return callback;
    }
}

So, i write a unit test for method:

    @Test
    void sendCallbackToOneSystem() {
        var cs = new CallbackSender();
        var callback = cs.sendCallbackToOneSystem();
        assertEquals(1L, callback.id());
        assertEquals("NEW", callback.status());
        
        // and here I want to make sure that NO OTHER FIELDS have been "touched"/set
    }

Well, my question is how to do an assertions, that method sendCallbackToOneSystem does nothig with any fields of CallbackDTO except id and status ?
Ofcource i can assert for all possible fields for “default” values (eg null or 0 or empty etc) but may be there is a more elegant way ?