Method TestDoExchangeNoData

cpp/src/arrow/flight/test_definitions.cc:375–386

Test pure-metadata DoExchange to ensure nothing blocks waiting for schema messages

// Test pure-metadata DoExchange to ensure nothing blocks waiting for
// schema messages
void DataTest::TestDoExchangeNoData() {
  auto descr = FlightDescriptor::Command("counter");
  ASSERT_OK_AND_ASSIGN(auto exchange, client_->DoExchange(descr));
  std::unique_ptr<FlightStreamReader> reader = std::move(exchange.reader);
  std::unique_ptr<FlightStreamWriter> writer = std::move(exchange.writer);
  ASSERT_OK(writer->DoneWriting());
  ASSERT_OK_AND_ASSIGN(auto chunk, reader->Next());
  ASSERT_EQ(nullptr, chunk.data);
  ASSERT_NE(nullptr, chunk.app_metadata);
  ASSERT_EQ("0", chunk.app_metadata->ToString());
  ASSERT_OK(writer->Close());
}
// Test sending a schema without any data, as this hits an edge case
// in the client-side writer.
void DataTest::TestDoExchangeWriteOnlySchema() {