question: public void verify ( ) { super . verify ( ) ; assertEquals ( "Sets should be equal" , confirmed , collection ) ; assertEquals ( "Sets should have equal hashCodes" , confirmed . hashCode ( ) , collection . hashCode ( ) ) ; Collection set = makeConfirmedCollection ( ) ; Iterator iterator = collection . iterator ( ) ; while ( iterator . hasNext ( ) ) { assertTrue ( "Set.iterator should only return unique elements" , set . add ( iterator . next ( ) ) ) ; } }
target:  Provides additional verifications for sets.