### Question:
Datastore { public ReserveIdsResponse reserveIds(ReserveIdsRequest request) throws DatastoreException { try (InputStream is = remoteRpc.call("reserveIds", request)) { return ReserveIdsResponse.parseFrom(is); } catch (IOException exception) { throw invalidResponseException("reserveIds", exception); } } Datastore(RemoteRpc remoteRpc); void resetRpcCount(); int getRpcCount(); AllocateIdsResponse allocateIds(AllocateIdsRequest request); BeginTransactionResponse beginTransaction(BeginTransactionRequest request); CommitResponse commit(CommitRequest request); LookupResponse lookup(LookupRequest request); ReserveIdsResponse reserveIds(ReserveIdsRequest request); RollbackResponse rollback(RollbackRequest request); RunQueryResponse runQuery(RunQueryRequest request);  }### Answer:
@Test public void reserveIds() throws Exception { ReserveIdsRequest.Builder request = ReserveIdsRequest.newBuilder(); ReserveIdsResponse.Builder response = ReserveIdsResponse.newBuilder(); expectRpc("reserveIds", request.build(), response.build()); }