Spock throw exception test

Question

I test Java code with Spock. I test this code:

 try {
    Set<String> availableActions = getSthAction()
    List<String> goodActions = getGoodAction()
    if (!CollectionUtils.containsAny(availableActions ,goodActions )){
       throw new CustomException();
    }
} catch (AnotherCustomExceptio e) {
     throw new CustomException(e.getMessage());
}

I wrote test:

def "some test"() {
    given:
    bean.methodName(_) >> {throw new AnotherCustomExceptio ("Sth wrong")}
    def order = new Order();
    when:
    validator.validate(order )
    then:
    final CustomException exception = thrown()
}

And it fails because AnotherCustomExceptio is thrown. But in the try{}catch block I catch this exception and throw a CustomException so I expected that my method will throw CustomException and not AnotherCustomExceptio. How do I test it?

Can you expand the context of the Java Code, showing `bean` and `validator`, `Order`? — dmahapatro, Mar 31 '14 at 14:29
It's not clear how the production code and test code shown above fit together. (E.g. there is no call to `bean#methodName` in the production code.) Most likely, the exception isn't thrown from the try-block shown above. You should be able to verify this in the debugger. — Peter Niederwieser, Mar 31 '14 at 18:27
I do not know :) I wrote this question year ago :) But, what about move " bean.methodName(_) >> {throw new AnotherCustomExceptio ("Sth wrong")}" to "when" section. Could you try? — Piotr Sobolewski, May 13 '15 at 07:06

score 68 · Accepted Answer · edited Sep 11 '15 at 11:12

68

I believe your then block needs to be fixed. Try the following syntax:

then:
thrown CustomException

edited Sep 11 '15 at 11:12

aldrael

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answered Mar 04 '15 at 20:07

Marcos Carceles

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score 54 · Answer 2 · answered Aug 23 '19 at 07:18

54

If you would like to evaluate for instance the message on the thrown Exception, you could do something like:

then:
def e = thrown(CustomException)
e.message == "Some Message"

answered Aug 23 '19 at 07:18

Dave

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Ajay Kumar · Answer 3 · 2021-03-10T14:05:11.373

10

There could be multiple ways to handle the exception in then:

thrown(CustomException)

or

thrown CustomException

As well we can check if no Exception is thrown in the Test case -

then:

noExceptionThrown()

edited Mar 10 '21 at 14:05

answered May 16 '17 at 05:00

Ajay Kumar

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Both the "doThrow" and "when" statements seem to be from Mockito. Will Mockito statements work with a Spock mock, or does the mock object have to be created through Mockito? – Steve Gelman Aug 30 '19 at 13:55
@SteveGelman by "when", are you referring to the [Spock `when:` block label](https://spockframework.org/spock/docs/1.3/all_in_one.html#_when_and_then_blocks)? – cellepo May 17 '23 at 18:43

Spock throw exception test

3 Answers3