Junit using groovy expected exception

I have Spring boot application. I use Junit+Mockito to unit test it. All the test cases were written using Java. I recently made a decision to write test cases using Groovy though the application code will remain in Java.

I encountered a weird scenario while testing expected exceptions.

Scenario 1: Testing Expected exception using Junit + Groovy (without shouldFail):

    @Test(expected = NoResultException.class) 
    void testFetchAllNoResultsReturned() throws Exception {
        List<Name> namesLocal = null;
        when(Service.fetchAllNames(id)).thenThrow(
                new NoResultException(""))
        namesLocal = (service.fetchAllNames(id)
        assert(namesLocal==null)
        verify(service, times(1)).fetchAllNames(id)
    }

As per the above test case, service.fetchAllNames call should throw a NoResultException. This aspect of testing seems to work well. However, the assert and verify after that are not called. As soon as the exception is encountered, the method execution stops. However, my earlier test case written in Java worked perfectly well. This issue happened only after I switched to Groovy.

After doing some Google search I found there is a method called shouldFail provided by GroovyTestCase class which can be used for this scenario as per this link. And it did resolve my issue.

Scenario 2: Testing Expected exception using Junit + Groovy (with shouldFail ):

    @Test
    void testFetchAllNoResultsReturned() throws Exception {
        List<Name> namesLocal = null;
        when(Service.fetchAllNames(id)).thenThrow(
                new NoResultException(""))
        shouldFail(NoResultException.class) {
            namesLocal = (Service.fetchAllNames(id)
        }
        assert(namesLocal==null)
        verify(Service, times(1)).fetchAllNames(id)
    }

My doubt is, is this how it is supposed to work or am I missing something. If this is how it is supposed to work, is there any reason behind Groovy doing it this way? I tried to look for reasons on the internet but I couldn't get many leads.