### Question:
DynamoDBLeaseRefresher implements LeaseRefresher { public void deleteAll() throws DependencyException, InvalidStateException, ProvisionedThroughputException { List<Lease> allLeases = listLeases(); log.warn("Deleting {} items from table {}", allLeases.size(), table); final AWSExceptionManager exceptionManager = createExceptionManager(); for (final Lease lease : allLeases) { DeleteItemRequest deleteRequest = DeleteItemRequest.builder().tableName(table) .key(serializer.getDynamoHashKey(lease)).build(); try { try { FutureUtils.resolveOrCancelFuture(dynamoDBClient.deleteItem(deleteRequest), dynamoDbRequestTimeout); } catch (ExecutionException e) { throw exceptionManager.apply(e.getCause()); } catch (InterruptedException e) { throw new DependencyException(e); } } catch (DynamoDbException | TimeoutException e) { throw convertAndRethrowExceptions("deleteAll", lease.leaseKey(), e); } } } @Deprecated  DynamoDBLeaseRefresher(final String table, final DynamoDbAsyncClient dynamoDBClient,
            final LeaseSerializer serializer, final boolean consistentReads); @Deprecated  DynamoDBLeaseRefresher(final String table, final DynamoDbAsyncClient dynamoDBClient,
                                  final LeaseSerializer serializer, final boolean consistentReads,
                                  @NonNull final TableCreatorCallback tableCreatorCallback); @Deprecated  DynamoDBLeaseRefresher(final String table, final DynamoDbAsyncClient dynamoDBClient,
                                  final LeaseSerializer serializer, final boolean consistentReads,
                                  @NonNull final TableCreatorCallback tableCreatorCallback, Duration dynamoDbRequestTimeout);  DynamoDBLeaseRefresher(final String table, final DynamoDbAsyncClient dynamoDBClient,
                                  final LeaseSerializer serializer, final boolean consistentReads,
                                  @NonNull final TableCreatorCallback tableCreatorCallback, Duration dynamoDbRequestTimeout,
                                  final BillingMode billingMode); @Override boolean createLeaseTableIfNotExists(@NonNull final Long readCapacity, @NonNull final Long writeCapacity); @Override boolean leaseTableExists(); @Override boolean waitUntilLeaseTableExists(long secondsBetweenPolls, long timeoutSeconds); @Override List<Lease> listLeasesForStream(StreamIdentifier streamIdentifier); @Override List<Lease> listLeases(); @Override boolean isLeaseTableEmpty(); @Override boolean createLeaseIfNotExists(@NonNull final Lease lease); @Override Lease getLease(@NonNull final String leaseKey); @Override boolean renewLease(@NonNull final Lease lease); @Override boolean takeLease(@NonNull final Lease lease, @NonNull final String owner); @Override boolean evictLease(@NonNull final Lease lease); void deleteAll(); @Override void deleteLease(@NonNull final Lease lease); @Override boolean updateLease(@NonNull final Lease lease); @Override void updateLeaseWithMetaInfo(Lease lease, UpdateField updateField); @Override ExtendedSequenceNumber getCheckpoint(String leaseKey);  }### Answer:
@Test public void testDeleteAllLeasesTimesOut() throws Exception { TimeoutException te = setRuleForDependencyTimeout(); when(dynamoDbClient.scan(any(ScanRequest.class))).thenReturn(mockScanFuture); when(mockScanFuture.get(anyLong(), any())).thenReturn(ScanResponse.builder().items(Collections.emptyMap()).build()); when(leaseSerializer.fromDynamoRecord(any())).thenReturn(lease); when(leaseSerializer.getDynamoHashKey(any(Lease.class))).thenReturn(Collections.emptyMap()); when(dynamoDbClient.deleteItem(any(DeleteItemRequest.class))).thenReturn(mockDeleteFuture); when(mockDeleteFuture.get(anyLong(), any())).thenThrow(te); verifyCancel(mockDeleteFuture, () -> leaseRefresher.deleteAll()); }