spock, mock a method response in a spring bean - spring

Question

I have an integration test written in groovy (spock) in spring boot application. One of the application beans is called Validator it has the follwoing method:
public void validateIssueDates(final List<Timestamp> issueDates) {
issueDates.forEach(issueDate -> {
final Timestamp now = Timestamp.valueOf(LocalDateTime.now());
if (issueDate.before(now)) {
throw new IllegalArgumentException("Issue date is before current date");
}
});
}
In the Validator class there are other methods. In my spock integration test I would like to mock response for that particular method only. In the following way:
Validator.validateIssueDates(_) >> null
I want other validations to take place, but not this one. Bascially I want to achieve this but with spock. I would like to eliminate the validateIssueDates() method from being executed

Answer 1

solution using Spock
It's done using [#SpringSpy][2].
First we annotate field with a spring bean we want to wrap in spy object. For example:
#SpringSpy
private CarValidator carValidator;
then in our test, in then part we define how we want to override method from a a bean/spy:
then:
3 * carValidator.validateIssueDates(_) >> null
Solution using Mockito (as an additional approach, it's not related to spock solution)
I have got that pretty easy using spy in Mockito. Despite many trials (and errors) with spock's spy, It just doesn't want to work. If I get that, I post it here. For now, I can only share Mockito solution:
#Profile("test")
#Configuration
public class BeanConfig {
#Bean
#Primary
public CarValidator getCarValidatorSpy(CarValidator validator) {
CarValidator carValidatorSpy = Mockito.spy(validator);
Mockito.doNothing().when(carValidatorSpy).validateIssueDates(Mockito.any(CarDto.class));
return carValidatorSpy;
}
}
That's all. Seems fairly straightforward.