private OffsetFetchResponse offsetFetchResponse(TopicPartition tp, Errors partitionLevelError, String metadata, long offset) {
        return offsetFetchResponse(tp, partitionLevelError, metadata, offset, Optional.empty());
    }
Verifies that subscription change updates SubscriptionState correctly even after JoinGroup failures
that don't re-invoke onJoinPrepare.
clients/src/test/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinatorTest.java