Method MatchAndExplain

cpp/src/arrow/testing/matchers.h:251–272

      }

      bool MatchAndExplain(const Res& maybe_value,
                           testing::MatchResultListener* listener) const override {
        const Status& status = ToStatus(maybe_value);
        testing::StringMatchResultListener value_listener;

        bool match = status.code() == code_;
        if (message_matcher_) {
          match = match &&
                  message_matcher_->MatchAndExplain(status.message(), &value_listener);
        }

        if (match) {
          *listener << "whose error matches";
        } else if (status.ok()) {
          *listener << "whose non-error doesn't match";
        } else {
          *listener << "whose error doesn't match";
        }

        testing::internal::PrintIfNotEmpty(value_listener.str(), listener->stream());
        return match;
      }

      const StatusCode code_;
      const std::optional<testing::Matcher<std::string>> message_matcher_;