Method AssertSpanSuccessfulNow

cpp/src/arrow/util/future_test.cc:1463–1468

Assert the given futures are successful *now

  // Assert the given futures are successful *now*
  void AssertSpanSuccessfulNow(int start, int stop) {
    const auto& futures = executor_->futures();
    for (int fut_index = start; fut_index < stop; ++fut_index) {
      ASSERT_TRUE(IsFutureFinished(futures[fut_index].state()));
    }
  }

  void AssertAllSuccessfulNow() {
    AssertSpanSuccessfulNow(0, static_cast<int>(executor_->futures().size()));