RSRP-469343: Failed to debug unit test: "Transition failed: Transition from state on event . There was no endpoint listening"

I'm using ReSharper Ultimate 2018.1 Build 112.0.20180414.70444 / Visual Studio Professional 2017 version 15.6.6. I have a .NET desktop project with MSTest unit tests. I tried to run a single unit test (by right-clicking a test in the Unit Test Sessions window and selecting "Debug Unit Tests" option). Test did not run, result was reported as inconclusive, and one error was reported by ReSharper:

2018.04.19 18:39:09.735   ERROR Transition failed: Transition from state <RunnerStarting> on event <local::RunnerStarted>. There was no endpoint listening at net.pipe://mynamehere/TestExecutor/15008 that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details. The pipe endpoint 'net.pipe://mynamehere/TestExecutor/15008' could not be found on your local machine.

--- EXCEPTION #1/3 [PipeException]
Message = “The pipe endpoint 'net.pipe://mynamehere/TestExecutor/15008' could not be found on your local machine.”
ExceptionPath = Root.InnerException.InnerException
ClassName = System.IO.PipeException
HResult = COR_E_IO=80131620

--- Outer ---

--- EXCEPTION #2/3 [EndpointNotFoundException]
Message = “There was no endpoint listening at net.pipe://mynamehere/TestExecutor/15008 that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.”
ExceptionPath = Root.InnerException
ClassName = System.ServiceModel.EndpointNotFoundException
InnerException = “Exception #1 at Root.InnerException.InnerException”
RemoteStackTraceString = “
  Server stack trace: 
     at System.ServiceModel.Channels.PipeConnectionInitiator.GetPipeName(Uri uri, IPipeTransportFactorySettings transportFactorySettings)
     at System.ServiceModel.Channels.NamedPipeConnectionPoolRegistry.NamedPipeConnectionPool.GetPoolKey(EndpointAddress address, Uri via)
     at System.ServiceModel.Channels.CommunicationPool`2.TakeConnection(EndpointAddress address, Uri via, TimeSpan timeout, TKey& key)
     at System.ServiceModel.Channels.ConnectionPoolHelper.EstablishConnection(TimeSpan timeout)
     at System.ServiceModel.Channels.ClientFramingDuplexSessionChannel.OnOpen(TimeSpan timeout)
     at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
     at System.ServiceModel.Channels.ServiceChannel.OnOpen(TimeSpan timeout)
     at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
     at System.ServiceModel.Channels.ServiceChannel.CallOpenOnce.System.ServiceModel.Channels.ServiceChannel.ICallOnce.Call(ServiceChannel channel, TimeSpan timeout)
     at System.ServiceModel.Channels.ServiceChannel.CallOnceManager.CallOnce(TimeSpan timeout, CallOnceManager cascade)
     at System.ServiceModel.Channels.ServiceChannel.EnsureOpened(TimeSpan timeout)
     at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
     at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
     at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
  
  Exception rethrown at [0]:
”
HResult = COR_E_SYSTEM=80131501
Source = mscorlib
StackTraceString = “
  at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
     at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
     at Microsoft.VisualStudio.TestPlatform.Core.ITestExecutorService.InitializeConnection(IEnumerable`1 pathToAdditionalExtensions, Boolean loadOnlyWellKnownExtensions)
     at JetBrains.ReSharper.UnitTesting.MSTest.Provider.Execution.Wcf.TestExecutorServiceProxy.InitializeConnection(IEnumerable`1 pathToAdditionalExtensions, Boolean loadOnlyWellKnownExtensions)
     at JetBrains.ReSharper.UnitTesting.MSTest.Provider.Execution.MsTestExecutionProtocol.<>c__DisplayClass32_0.<OpenClient>b__1(ITestExecutorService x)
     at JetBrains.ReSharper.UnitTesting.MSTest.Provider.Execution.Wcf.ResurrectableProxy`1.WithTimeout(Action`1 action)
     at JetBrains.ReSharper.UnitTesting.MSTest.Provider.Execution.MsTestExecutionProtocol.OpenClient()
     at Appccelerate.StateMachine.Machine.ActionHolders.ArgumentLessActionHolder.Execute(Object argument)
     at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryAction(IActionHolder actionHolder, ITransitionContext`2 context)
”

--- Outer ---

--- EXCEPTION #3/3 [LoggerException]
Message = “Transition failed: Transition from state <RunnerStarting> on event <local::RunnerStarted>. There was no endpoint listening at net.pipe://mynamehere/TestExecutor/15008 that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.”
ExceptionPath = Root
ClassName = JetBrains.Util.LoggerException
InnerException = “Exception #2 at Root.InnerException”
HResult = COR_E_APPLICATION=80131600
StackTraceString = “
  at JetBrains.ReSharper.UnitTesting.MSTest.Provider.Execution.MsTestExecutionProtocol.<.ctor>b__24_17(Object sender, TransitionExceptionEventArgs`2 args)
     at Appccelerate.StateMachine.Machine.StateMachine`2.RaiseEvent[T](EventHandler`1 eventHandler, T arguments, ITransitionContext`2 context, Boolean raiseEventOnException)
     at Appccelerate.StateMachine.Machine.StateMachine`2.OnExceptionThrown(ITransitionContext`2 context, Exception exception)
     at Appccelerate.StateMachine.Machine.Contexts.TransitionContext`2.OnExceptionThrown(Exception exception)
     at Appccelerate.StateMachine.Machine.States.State`2.HandleException(Exception exception, ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.States.State`2.HandleEntryActionException(ITransitionContext`2 context, Exception exception)
     at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryAction(IActionHolder actionHolder, ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryActions(ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.States.State`2.Entry(ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.Transitions.Transition`2.Fire(IState`2 source, IState`2 target, ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.Transitions.Transition`2.Fire(ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.States.State`2.Fire(ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.StateMachine`2.Fire(TEvent eventId, Object eventArgument)
     at Appccelerate.StateMachine.ActiveStateMachine`2.ProcessEventQueue(CancellationToken cancellationToken)
     at Appccelerate.StateMachine.ActiveStateMachine`2.<Start>b__32_0()
     at System.Threading.Tasks.Task.InnerInvoke()
     at System.Threading.Tasks.Task.Execute()
     at System.Threading.Tasks.Task.ExecutionContextCallback(Object obj)
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot)
     at System.Threading.Tasks.Task.ExecuteEntry(Boolean bPreventDoubleExecution)
     at System.Threading.Tasks.ThreadPoolTaskScheduler.LongRunningThreadWork(Object obj)
     at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
     at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
     at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
     at System.Threading.ThreadHelper.ThreadStart(Object obj)
”

2018.04.19 18:39:09.860    WARN C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\CommonExtensions\Microsoft\TestWindow\vstest.executionengine.x86.exe exited with exit code (-1)
Output stream: Not available
Error stream: Not available
2018.04.19 18:39:09.861    WARN Element MyNamespace.MyClass.MyUnitTestName was left pending after its run completion.

Running the test again succeeded, so this was a one-time thing. I figured I'd report it just in case. I now see there are quite a few DEXP reports with similar stack traces.