UnitTest not running

Question

Hi, I'm using Microsoft Visual Studio Community 2019
Version 16.11.8

I created a C# Windows Forms-App (.NET Framework) and now trying to add a UnitTest for it.
For the beginning I tryed the first steps from tutorials in the Internet:

• Add new MSTest-Project
• It automatically creates a first test-class and I added an Assert.IsTrue(true) to it: using Microsoft.VisualStudio.TestTools.UnitTesting; namespace MyFirstUnitTest
  {
  [TestClass]
  public class UnitTest1
  {
  [TestMethod]
  public void TestMethod1()
  {
  Assert.IsTrue(true);
  }
  }
  }

If I now run the test in Test-Explorer, the test keeps in "not tested" state.
If I take a look in the Output window of Tests I see the Following exception:

========== Testermittlung wird gestartet ==========  
========== Testermittlung abgeschlossen: 1 Tests in "2,6 Sek." gefunden ==========  
========== Testlauf wird gestartet ==========  
Ausnahme beim Aufrufen von Executor "executor://mstestadapter/v2": Could not find file 'C:\Users\xxxxx\Documents\Projects\MyFirstUnitTest\TestResults\Deploy_xxxxxxx 2022-08-04 21_06_19'.  
Stapelüberwachung:  
   at System.IO.FileSystem.CreateDirectory(String fullPath, Byte[] securityDescriptor)  
   at System.IO.Directory.CreateDirectory(String path)  
   at Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.Utilities.FileUtility.CreateDirectoryIfNotExists(String directory)  
   at Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.Utilities.DeploymentUtilityBase.CreateDeploymentDirectories(IRunContext runContext)  
   at Microsoft.VisualStudio.TestPlatform.MSTestAdapter.PlatformServices.TestDeployment.Deploy(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle)  
   at Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.Execution.TestExecutionManager.RunTests(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle, TestRunCancellationToken runCancellationToken)  
   at Microsoft.VisualStudio.TestPlatform.MSTest.TestAdapter.MSTestExecutor.RunTests(IEnumerable`1 tests, IRunContext runContext, IFrameworkHandle frameworkHandle)  
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.RunTestsWithTests.InvokeExecutor(LazyExtension`2 executor, Tuple`2 executorUri, RunContext runContext, IFrameworkHandle frameworkHandle)  
   at Microsoft.VisualStudio.TestPlatform.CrossPlatEngine.Execution.BaseRunTests.RunTestInternalWithExecutors(IEnumerable`1 executorUriExtensionMap, Int64 totalTests)  

What can I do to get the UnitTest run? The folder its looking for really not exists. Who should create the folder "TestResults" normally?

Side Info:

• I tryed to run Visual Studio with Administrator rights
• I turned of my firewall
• I tryed to create the Test-Project with target Platform .NET core 3.1 and with .NET 5.0
• I restartet Visual Studio multiple times
  Nothing of all these changed anything, I always get the error Message above.

Testproject is using following NuGet Packeges:

• coverlet.collector V3.1.2
• Microsoft.NET-TestSdk V17.2.0
• MSTest.TestAdapter V2.2.10
• MSTest.TestFramework V 2.2.10

Answer 1

I found the problem: The ransomware-protection of windows prohibited the writing of new files for MSTest. I set it to allow-list, now it works :)