DataClientVeneerApi implements DataClientWrapper { @Override public void close() { delegate.close(); } DataClientVeneerApi(BigtableDataClient delegate); @Override BulkMutationWrapper createBulkMutation(String tableId); @Override BulkReadWrapper createBulkRead(String tableId); @Override ApiFuture<Void> mutateRowAsync(RowMutation rowMutation); @Override ApiFuture<Result> readModifyWriteRowAsync(ReadModifyWriteRow readModifyWriteRow); @Override ApiFuture<Boolean> checkAndMutateRowAsync(ConditionalRowMutation conditionalRowMutation); @Override ApiFuture<List<KeyOffset>> sampleRowKeysAsync(String tableId); @Override ApiFuture<Result> readRowAsync(
      String tableId, ByteString rowKey, @Nullable Filters.Filter filter); @Override ResultScanner readRows(Query request); @Override ApiFuture<List<Result>> readRowsAsync(Query request); @Override void readRowsAsync(Query request, StreamObserver<Result> observer); @Override void close();  }
@Test public void testClose() { doNothing().when(mockDataClient).close(); dataClientWrapper.close(); verify(mockDataClient).close(); }