Method FutureVoidFunc

library/cpp/threading/future/future_ut.cpp:150–153

            TPromise<void> Signal = NewPromise();
            TFuture<void> FutureVoidFunc(const TFuture<int>& future) {
                future.GetValue();
                return Signal;
            }
        };

        Y_UNIT_TEST(ShouldInvokeCallback) {