Test TransactionParticipant::getOldestActiveTimestamp timeout

storage_timestamp_tests.cpp

class TimeoutInGetOldestTransactionTimestamp : public MultiDocumentTransactionTest {
public:
    TimeoutInGetOldestTransactionTimestamp()
        : MultiDocumentTransactionTest("timeoutInGetOldestTransactionTimestamp") {}

    void run() {
        auto txnParticipant = TransactionParticipant::get(_opCtx);
        ASSERT(txnParticipant);

        AutoGetCollection txns(
            _opCtx, NamespaceString::kSessionTransactionsTableNamespace, LockMode::MODE_X);


        auto task = stdx::packaged_task<void()>([=] {
            TransactionParticipant::getOldestActiveTimestamp(Timestamp(0, 0));
        });

        auto result = task.get_future();
        stdx::thread t(std::move(task));
        auto mockClock =
            static_cast<ClockSourceMock*>(_opCtx->getServiceContext()->getFastClockSource());
        mockClock->advance(Seconds(1));
        t.join();
        result.get();
    }
};