How to resolve stack overflow problem during dotnet test?

First my setup:

.Net Core 3.1 (migrated from 2.2)
xUnit 2.4.1
xUnit Runner 2.4.1
Visual Studio 2019 16.4.2
Test.SDK 16.4.0

I've just migrated from .Net Core 2.2 to 3.1. I just fixed errors and changed my serializer to System.Text. My app is working just fine but...

Note: All my tests are integration tests which are using WebApplicationFactory.

I was always using Visual Studio Test Runner to run all tests, but then when I tried to Run All I got an error:

Notice that strange netcoreapp2.2, while I'm specifically using .Net Core 3.1 in MyTests and MyApp project.

[10.01.2020 2:05:03.939 PM] System.InvalidOperationException: The following TestContainer was not found 'D:\Projects\MyApp\MyTests\bin\Debug\netcoreapp2.2\GrabGoApiTests.dll'
   at Microsoft.VisualStudio.TestWindow.Client.TestContainer.TestContainerProvider.<GetTestContainerAsync>d__46.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Controller.TestContainerConfigurationQueryByTestsBase.<QueryTestContainerConfigurationsAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Controller.TestContainerConfigurationQuery.<GetTestContainerConfigurationsAsync>d__16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Controller.TestRunConfiguration.<UpdateAsync>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Controller.RunOperation.<RunTestsAsync>d__15.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Controller.Operation.<<Execute>b__37_0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Extensibility.ILoggerExtensions.<CallWithCatchAsync>d__10`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

And then I was thinking "Okay... Maybe VS is acting strange again I'll try running tests from console"

PS D:\Projekty\GrabGoAPI> dotnet test
Test run for D:\Projects\MyApp\MyTests\bin\Debug\netcoreapp3.1\GrabGoApiTests.dll(.NETCoreApp,Version=v3.1)
Microsoft (R) Test Execution Command Line Tool Version 16.3.0
Copyright (c) Microsoft Corporation.  All rights reserved.

Starting test execution, please wait...

A total of 1 test files matched the specified pattern.
The active test run was aborted. Reason: Test host process crashed : Stack overflow.


Test Run Aborted.
Total tests: Unknown
     Passed: 101
 Total time: 26,3009 Seconds

And now I'm here.

I found that. But I cannot Debug tests in Visual Studio to find out which tests are causing the problem.

Also dotnet test --blame are blaming random tests every time.

How can I find what is causing that StackOverflow exception?

Solution

I was due to System.Text.Json not handling Reference Loop as JSON.Net did.

Change to JSON.Net helped.