### Question:
ConsumerCoordinator extends AbstractCoordinator { public void close(long timeoutMs) { client.disableWakeups(); long now = time.milliseconds(); long endTimeMs = now + timeoutMs; try { maybeAutoCommitOffsetsSync(timeoutMs); now = time.milliseconds(); if (pendingAsyncCommits.get() > 0 && endTimeMs > now) { ensureCoordinatorReady(now, endTimeMs - now); now = time.milliseconds(); } } finally { super.close(Math.max(0, endTimeMs - now)); } } ConsumerCoordinator(ConsumerNetworkClient client,
                               String groupId,
                               int rebalanceTimeoutMs,
                               int sessionTimeoutMs,
                               int heartbeatIntervalMs,
                               List<PartitionAssignor> assignors,
                               Metadata metadata,
                               SubscriptionState subscriptions,
                               Metrics metrics,
                               String metricGrpPrefix,
                               Time time,
                               long retryBackoffMs,
                               boolean autoCommitEnabled,
                               int autoCommitIntervalMs,
                               ConsumerInterceptors<?, ?> interceptors,
                               boolean excludeInternalTopics,
                               final boolean leaveGroupOnClose); @Override String protocolType(); @Override List<ProtocolMetadata> metadata(); void updatePatternSubscription(Cluster cluster); void poll(long now, long remainingMs); long timeToNextPoll(long now); @Override boolean needRejoin(); void refreshCommittedOffsetsIfNeeded(); Map<TopicPartition, OffsetAndMetadata> fetchCommittedOffsets(Set<TopicPartition> partitions); void close(long timeoutMs); void commitOffsetsAsync(final Map<TopicPartition, OffsetAndMetadata> offsets, final OffsetCommitCallback callback); boolean commitOffsetsSync(Map<TopicPartition, OffsetAndMetadata> offsets, long timeoutMs); void maybeAutoCommitOffsetsNow();  }### Answer:
@Test public void testLeaveGroupOnClose() { final String consumerId = "consumer"; subscriptions.subscribe(singleton(topic1), rebalanceListener); client.prepareResponse(groupCoordinatorResponse(node, Errors.NONE)); coordinator.ensureCoordinatorReady(); client.prepareResponse(joinGroupFollowerResponse(1, consumerId, "leader", Errors.NONE)); client.prepareResponse(syncGroupResponse(singletonList(t1p), Errors.NONE)); coordinator.joinGroupIfNeeded(); final AtomicBoolean received = new AtomicBoolean(false); client.prepareResponse(new MockClient.RequestMatcher() { @Override public boolean matches(AbstractRequest body) { received.set(true); LeaveGroupRequest leaveRequest = (LeaveGroupRequest) body; return leaveRequest.memberId().equals(consumerId) && leaveRequest.groupId().equals(groupId); } }, new LeaveGroupResponse(Errors.NONE)); coordinator.close(0); assertTrue(received.get()); }