Method AssertStopRequested

cpp/src/arrow/util/cancel_test.cc:198–205

  }

  void AssertStopRequested() {
    BusyWait(1.0, [&]() { return stop_token_->IsStopRequested(); });
    ASSERT_TRUE(stop_token_->IsStopRequested());
    auto st = stop_token_->Poll();
    ASSERT_RAISES(Cancelled, st);
    ASSERT_EQ(st.message(), "Operation cancelled");
    ASSERT_EQ(internal::SignalFromStatus(st), expected_signal_);
  }

#ifndef _WIN32
  void RunInChild(std::function<void()> func) {