Method AssertAllSuccessful

cpp/src/arrow/util/future_test.cc:1433–1439

Assert the given futures are *eventually* successful

  // Assert the given futures are *eventually* successful
  void AssertAllSuccessful(const std::vector<int>& future_indices) {
    const auto& futures = executor_->futures();
    for (const auto fut_index : future_indices) {
      ASSERT_OK(futures[fut_index].status());
      ASSERT_EQ(*futures[fut_index].result(), fut_index);
    }
  }

  // Assert the given futures are *eventually* failed
  void AssertAllFailed(const std::vector<int>& future_indices) {