Function TEST

library/cpp/threading/future/ut_gtest/coroutine_traits_ut.cpp:11–85

TEST(TestFutureTraits, Simple) {
    TVector<TString> result;

    auto coroutine1 = [&result]() -> NThreading::TFuture<size_t> {
        result.push_back("coroutine1");
        co_return 1;
    };

    NThreading::TPromise<size_t> coroutine2SuspendPromise = NThreading::NewPromise<size_t>();
    auto coroutine2 = [&result, coroutine2SuspendFuture = coroutine2SuspendPromise.GetFuture()]() -> NThreading::TFuture<size_t> {
        result.push_back("coroutine2");

        result.push_back("pre_coroutine2_suspend_future");
        size_t futureResult = co_await coroutine2SuspendFuture;
        result.push_back("post_coroutine2_suspend_future");

        co_return 2 + futureResult;
    };

    auto coroutineAll = [&]() -> NThreading::TFuture<size_t> {
        Y_DEFER {
            result.push_back("coroutine_all_destroy");
        };

        result.push_back("pre_coroutine1");
        size_t coroutine1Res = co_await coroutine1();
        result.push_back("post_coroutine1");

        result.push_back("pre_coroutine2");
        size_t coroutine2Res = co_await coroutine2();
        result.push_back("post_coroutine2");

        co_return coroutine1Res + coroutine2Res;
    };

    NThreading::TFuture<size_t> coroutineAllFuture = coroutineAll();
    EXPECT_FALSE(coroutineAllFuture.HasValue());
    EXPECT_FALSE(coroutineAllFuture.HasException());
    EXPECT_THAT(
        result,
        ::testing::ContainerEq(
            TVector<TString>({
                "pre_coroutine1",
                "coroutine1",
                "post_coroutine1",

                "pre_coroutine2",
                "coroutine2",
                "pre_coroutine2_suspend_future"
            })
        )
    );

    coroutine2SuspendPromise.SetValue(3u);
    EXPECT_TRUE(coroutineAllFuture.HasValue());
    EXPECT_EQ(coroutineAllFuture.GetValue(), 6u);
    EXPECT_THAT(
        result,