Implement aggregate test for expectedExceptions

[andreassimon]

for example

    @Test(timeout = 1000L)
    void should_not_be_changed_after_deletion() {
        given {
            event(printmediumId, new Printmedium_was_created(pages: 4, basePDF: aPdfFile))
            event(printmediumId, new Printmedium_was_deleted())
        }

        expectException(PrintmediumWasDeletedException) {
            get(Printmedium, printmediumId).rename('New name')
        }
    }