private int sendFetches() {
            fetch(new HashMap<>());
            NetworkClientDelegate.PollResult pollResult = poll(time.milliseconds());
            networkClientDelegate.addAll(pollResult.unsentRequests);
            return pollResult.unsentRequests.size();
        }
Assert that the {@link ShareFetchCollector#collect(ShareFetchBuffer)} latest fetch} does not contain any
{@link ShareFetch#records() user-visible records}, and is {@link ShareFetch#isEmpty() empty}.

@param reason the reason to include for assertion methods such as {@link org.junit.jupiter.api.Assertions#assertTrue(boolean, String)}
clients/src/test/java/org/apache/kafka/clients/consumer/internals/ShareConsumeRequestManagerTest.java