Visual Studio Test Explorer doesn't run tests after changes

Question

I am using Visual Studio 2022 Community Edition. Whenever I delete or rename existing test methods (including copy, paste, then rename), Visual Studio fails to run tests after the changes are made.

• I can right click on previously run tests and run them, but any of the renamed tests I cannot. Likewise, any new tests that had been created since the last successful run until I renamed an existing test method.
• I can create new tests from scratch with no issues as long as no other tests are renamed.
• When I restart Visual Studio, all of the tests are recognized and run fine after the restart. But it's quite frustrating having to constantly restart Visual Studio while writing tests. I copy / paste a test method and rename it a lot, which causes this issue to happen every time.
• I have tried removing and reinstalled Micosoft.NET.Test.Sdk, MSTest.Adapter and MSTest.TestFramework. I have deleted the repo, and re-cloned the repo essentially removing the hidden .vs folder.
• This happens on two different computers, multiple solutions, both reference the same repos.
• I have gone as far as creating a new .NET 6 Test project, and copy and pasted all the tests from the previous project to the new one. I do get several errors when I attempt to run the tests after doing so listed below.

System.InvalidOperationException: TestsForOrigin: Unknown TestCaseRecord.Origin value Unknown
   at Microsoft.VisualStudio.TestStorage.MergedTestGroup.TestsForOrigin(TestCaseOrigin origin)
   at Microsoft.VisualStudio.TestStorage.MergedTestGroup.MarkAsStale()
   at Microsoft.VisualStudio.TestStorage.MergedTestIndex.MarkAsStale(TestCaseOriginKind originKind)
   at Microsoft.VisualStudio.TestStorage.TestStoreIndexSet.MarkTestsAsStale(TestCaseOriginKind originKind)
   at Microsoft.VisualStudio.TestStorage.TestStore.MarkTestsAsStale(TestCaseOriginKind originKind)
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.StartTestRun(IEnumerable`1 containers, IEnumerable`1 requestedTestCasesToRun, Boolean isHotReloadRun)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.StartTestRun(IEnumerable`1 containers, IEnumerable`1 requestedTestCasesToRun, Boolean isHotReloadedRun, Int32 totalIterations)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.StartTestRun(ICollection`1 requests, Int32 totalIterations)
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.Collections.Generic.KeyNotFoundException: The given key 'C:\Users\My Name Removed\source\repos\RepoNameRemoved\LibraryRenamed.ClassRenamed.Tests\bin\Debug\net6.0\LibraryRenamed.ClassRenamed.Tests.dll' was not present in the dictionary.
   at System.Collections.Immutable.ImmutableDictionary`2.get_Item(TKey key)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToTestResultRecord(TestResultRecord testResult, IImmutableDictionary`2 containerLookup, TestStore store, Int32 testRunIndex, Boolean isHotReloadedRun, Int32 currentIteration)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.ToLocalTestResultRecord(TestResultRecord testResult)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at Microsoft.VisualStudio.TestWindow.Host.TestRunSession.AddTestResultRecords(IEnumerable`1 testResultRecords)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.AddRemoteTestResultRecords(IEnumerable`1 testResults)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunUpdate(IEnumerable`1 testResults, IEnumerable`1 activeTests)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.TestResponseHandler.<>c__DisplayClass16_0.<HandleTestRunStatsChangeAsync>b__0()
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.CallInternalWithLogging(IInternalLogger log, Action action, Boolean shouldThrow)
System.InvalidOperationException: TestsForOrigin: Unknown TestCaseRecord.Origin value Unknown
   at Microsoft.VisualStudio.TestStorage.MergedTestGroup.TestsForOrigin(TestCaseOrigin origin)
   at Microsoft.VisualStudio.TestStorage.MergedTestGroup.MarkAsNotRunningAndNotPending()
   at Microsoft.VisualStudio.TestStorage.MergedTestIndex.MarkAsNotRunningAndNotPending(TestCaseOriginKind originKind)
   at Microsoft.VisualStudio.TestStorage.TestStoreIndexSet.MarkTestsAsNotRunningAndNotPending(TestCaseOriginKind originKind)
   at Microsoft.VisualStudio.TestStorage.TestStore.MarkTestsAsNotRunningAndNotPending(TestCaseOriginKind originKind)
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.EndTestRun()
   at Microsoft.VisualStudio.TestWindow.Host.VsTestRunSession.OnTestRunCompleted()
   at Microsoft.VisualStudio.TestWindow.Utilities.EventPumpExtensions.<>c__DisplayClass0_0.<EnqueueAsync>b__0()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.<RunTestsAsync>d__27.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Host.TestPlatformProvider.<RunTestsAsync>d__25.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.TestWindow.Logging.ILoggerExtensions.<CallWithCatchAsync>d__11`1.MoveNext()```

Answer 1

Update 2/14/2023: issue resolved

Test Method rename fix is now out in Visual studio 17.4.5 (released 2/14/2023)
see change log with "Unit test startup fails with an exception when a test method is renamed"

---

Update 1/31/2023:

This issue will be resolved in VS 17.4.5 and 7.5 preview 4. (see https://github.com/microsoft/testfx/issues/1564)

---

I was having the same issue. Interestingly a simple restart of Visual Studio resolved it for me. It also looks like we can also downgrade the MSTest.TestAdapter and MSTest.TestFramework NuGet package to 2.2.8.

The restart idea came from here: https://github.com/microsoft/vstest/issues/4208

It seems to be a recent bug that started popping up last week. It looks like a fix has already in the works:

Osvaldo Calles [MSFT] : We already have a fix for this, but it is in code review. Unfortunately there is no workaround, other than downgrading the NuGet package version to 2.2.8. Source: https://developercommunity.visualstudio.com/t/Unit-test-startup-fails-with-an-exceptio/10226576

Answer 2

Delete all .vs, .vscode, bin, obj folders from coresponding projects & solution.