Mono<Locale> getLocaleFromSubscriber(Subscriber subscriber) {
        // TODO get locale from subscriber
        return Mono.just(Locale.getDefault());
    }
@Test
    void getLocaleFromSubscriberTest() {
        var subscription = mock(Subscriber.class);

        notificationCenter.getLocaleFromSubscriber(subscription)
            .as(StepVerifier::create)
            .expectNext(Locale.getDefault())
            .verifyComplete();
    }