TransactionScope in async Init

Description

Async context started in TestInitialize method is not flow across thread continuations in Test method

Steps to reproduce

using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Threading.Tasks;
using System.Transactions;
using System.Threading;

namespace testfail
{
    [TestClass]
    public class UnitTest1
    {
        TransactionScope _transactionScope;
        AsyncLocal<string> _asyncLocal;
        [TestInitialize]
        public async Task Init()
        {
            _transactionScope = new TransactionScope(System.Transactions.TransactionScopeAsyncFlowOption.Enabled);
            _asyncLocal = new AsyncLocal<string>();
            _asyncLocal.Value = "teststr";
            await Task.Delay(100);
            Assert.IsNotNull(Transaction.Current, "Transaction.Current in Init is null");
        }

        [TestCleanup]
        public void TestCleanup()
        {
            _transactionScope?.Dispose();
        }

        [TestMethod]
        public void TestMethodUsesTransactionFromInit()
        {
            Assert.IsNotNull(Transaction.Current, "Transaction.Current is null");
            Assert.AreEqual("teststr", _asyncLocal.Value);
        }

        [TestMethod]
        public async Task TestMethodUsesTransactionCreatedBySelf()
        {
            using (var localTransactionScope = new TransactionScope(System.Transactions.TransactionScopeAsyncFlowOption.Enabled))
            {
                Assert.IsNotNull(Transaction.Current, "Transaction.Current before await is null");
                await Task.Delay(100);
                Assert.IsNotNull(Transaction.Current, "Transaction.Current after await is null");
            }

        }
    }
}

Expected behavior

Test passed because async context flow across thread continuations

Actual behavior

Async context flow only in Init method. Also if I started async operation in TestMethod it’s also worked.

Environment

.NETCoreApp,Version=v3.0 Microsoft ® Test Execution Command Line Tool Version 16.3.0

[ajbeaven]

This is really disappointing, particularly because this worked in previous versions of .NET (at least it does on my old, .NET Framework 4.8 app). Is this an issue with .NET Core?

[jayaranigarg]

@alexey-gusarov : As a workaround, you can store the value of Transaction.Current in a static member variable and use that member variable instead in your test methods.