### Question:
Fetcher implements SubscriptionState.Listener, Closeable { public int sendFetches() { Map<Node, FetchRequest.Builder> fetchRequestMap = createFetchRequests(); for (Map.Entry<Node, FetchRequest.Builder> fetchEntry : fetchRequestMap.entrySet()) { final FetchRequest.Builder request = fetchEntry.getValue(); final Node fetchTarget = fetchEntry.getKey(); log.debug("Sending {} fetch for partitions {} to broker {}", isolationLevel, request.fetchData().keySet(), fetchTarget); client.send(fetchTarget, request) .addListener(new RequestFutureListener<ClientResponse>() { @Override public void onSuccess(ClientResponse resp) { FetchResponse response = (FetchResponse) resp.responseBody(); if (!matchesRequestedPartitions(request, response)) { log.warn("Ignoring fetch response containing partitions {} since it does not match " + "the requested partitions {}", response.responseData().keySet(), request.fetchData().keySet()); return; } Set<TopicPartition> partitions = new HashSet<>(response.responseData().keySet()); FetchResponseMetricAggregator metricAggregator = new FetchResponseMetricAggregator(sensors, partitions); for (Map.Entry<TopicPartition, FetchResponse.PartitionData> entry : response.responseData().entrySet()) { TopicPartition partition = entry.getKey(); long fetchOffset = request.fetchData().get(partition).fetchOffset; FetchResponse.PartitionData fetchData = entry.getValue(); log.debug("Fetch {} at offset {} for partition {} returned fetch data {}", isolationLevel, fetchOffset, partition, fetchData); completedFetches.add(new CompletedFetch(partition, fetchOffset, fetchData, metricAggregator, resp.requestHeader().apiVersion())); } sensors.fetchLatency.record(resp.requestLatencyMs()); } @Override public void onFailure(RuntimeException e) { log.debug("Fetch request {} to {} failed", request.fetchData(), fetchTarget, e); } }); } return fetchRequestMap.size(); } Fetcher(ConsumerNetworkClient client,
                   int minBytes,
                   int maxBytes,
                   int maxWaitMs,
                   int fetchSize,
                   int maxPollRecords,
                   boolean checkCrcs,
                   Deserializer<K> keyDeserializer,
                   Deserializer<V> valueDeserializer,
                   Metadata metadata,
                   SubscriptionState subscriptions,
                   Metrics metrics,
                   FetcherMetricsRegistry metricsRegistry,
                   Time time,
                   long retryBackoffMs,
                   IsolationLevel isolationLevel); boolean hasCompletedFetches(); int sendFetches(); void resetOffsetsIfNeeded(Set<TopicPartition> partitions); void updateFetchPositions(Set<TopicPartition> partitions); Map<String, List<PartitionInfo>> getAllTopicMetadata(long timeout); Map<String, List<PartitionInfo>> getTopicMetadata(MetadataRequest.Builder request, long timeout); Map<TopicPartition, OffsetAndTimestamp> getOffsetsByTimes(Map<TopicPartition, Long> timestampsToSearch,
                                                                     long timeout); Map<TopicPartition, Long> beginningOffsets(Collection<TopicPartition> partitions, long timeout); Map<TopicPartition, Long> endOffsets(Collection<TopicPartition> partitions, long timeout); Map<TopicPartition, List<ConsumerRecord<K, V>>> fetchedRecords(); @Override void onAssignment(Set<TopicPartition> assignment); static Sensor throttleTimeSensor(Metrics metrics, FetcherMetricsRegistry metricsRegistry); @Override void close();  }### Answer:
@Test public void testFetchOnPausedPartition() { subscriptions.assignFromUser(singleton(tp1)); subscriptions.seek(tp1, 0); subscriptions.pause(tp1); assertFalse(fetcher.sendFetches() > 0); assertTrue(client.requests().isEmpty()); }