def collection = container.matching(spec).withType(String.class).matching(spec2);

        expect:
        toList(collection) == ["a"]
    }

    def restoresUserCodeApplicationWhenFilterSpecIsEvaluated() {
        def spec = Mock(Spec)
        def source = Stub(UserCodeSource)
        def collection = null

        given:
        userCodeApplicationContext.apply(source) {