Resharper not running xUnit tests

Question

I have a .NET Core project with xUnit. I can no longer run any tests with Resharper though. Even very simple tests are inconclusive. e.g.:

using Xunit;

public class MyTests
{
    [Fact]
    public void MySuperTest()
    {
        Assert.Equal(1, 1);
    }
}

The output log shows an exception:

2017.08.04 16:58:41.304    INFO BuildStage started
2017.08.04 16:58:41.304    INFO Build policy: Automatic
2017.08.04 16:58:42.636    INFO 1 projects built
2017.08.04 16:58:42.636 VERBOSE     Computershare.AssetManagement.Testing
2017.08.04 16:58:42.637    INFO BuildStage completed
2017.08.04 16:58:42.638    INFO RefreshProjectPropertiesStage started
2017.08.04 16:58:42.638    INFO RefreshProjectPropertiesStage completed
2017.08.04 16:58:42.640    INFO DiscoveryStage started
2017.08.04 16:58:42.641    INFO Test exploration required for 1 projects
2017.08.04 16:58:42.641 VERBOSE     Computershare.AssetManagement.Testing
2017.08.04 16:58:42.643    INFO DiscoveryStage completed
2017.08.04 16:58:42.643    INFO BuildPipelineStage started
2017.08.04 16:58:42.643    INFO BuildPipelineStage completed
2017.08.04 16:58:42.643    INFO ApplyRulesStage started
2017.08.04 16:58:42.647    INFO Got 1 elements (1 explicit) to run
2017.08.04 16:58:42.647    INFO Marking 1 elements as Pending
2017.08.04 16:58:42.679    INFO Marking elements as Pending completed
2017.08.04 16:58:42.679    INFO Distributing 1 elements into runs
2017.08.04 16:58:42.695    INFO Host Controller initialization started
2017.08.04 16:58:42.695 VERBOSE Host Controller: DebugTaskRunnerHostController
2017.08.04 16:58:42.695    INFO Host Controller initialization completed
2017.08.04 16:58:42.721    INFO Distributing elements completed
2017.08.04 16:58:42.721    INFO Created 1 unit-test runs
2017.08.04 16:58:42.721    INFO ApplyRulesStage completed
2017.08.04 16:58:42.721    INFO RunTestsStage started
2017.08.04 16:58:42.722 VERBOSE Running up to 1 unit-test runs in parallel
2017.08.04 16:58:42.727    INFO Run: 28147df6-3156-4f24-bd5a-ca737ab6c43a - Started
2017.08.04 16:58:42.728 VERBOSE     Provider: xUnit.net
    Project: Computershare.AssetManagement.Testing
    Target Framework: .NETCoreApp,Version=v1.1
    Strategy: JetBrains.ReSharper.UnitTestFramework.DotNetCore.DotNetVsTest.DotNetVsTestRunStrategy
    Runtime Enviroment:
        Platform Type: x64
        Platform Version: v4_0
2017.08.04 16:58:42.747   TRACE Register handler for message type 'TestSession.Message', protocol version '1'
2017.08.04 16:58:42.747   TRACE Register handler for message type 'ProtocolVersion', protocol version '<unset>'
2017.08.04 16:58:42.747   TRACE Register handler for message type 'TestSession.Connected', protocol version '<unset>'
2017.08.04 16:58:42.747   TRACE Register handler for message type 'TestExecution.CustomTestHostLaunch', protocol version '1'
2017.08.04 16:58:42.748   TRACE Register handler for message type 'TestExecution.Completed', protocol version '1'
2017.08.04 16:58:42.748   TRACE Register handler for message type 'TestExecution.StatsChange', protocol version '1'
2017.08.04 16:58:42.750    INFO Starting process: dotnet vstest /port:47441 
2017.08.04 16:58:42.754    INFO Started process with pid 12856
2017.08.04 16:58:43.266   TRACE Processing message 'TestSession.Connected'
2017.08.04 16:58:43.266   TRACE Processed message 'TestSession.Connected'
2017.08.04 16:58:43.272   TRACE Processing message 'ProtocolVersion'
2017.08.04 16:58:43.274    INFO Using test adapter: ...PROJECT PATH REMOVED...\bin\Debug\netcoreapp1.1\xunit.runner.visualstudio.dotnetcore.testadapter.dll
2017.08.04 16:58:43.274    WARN File ...PROJECT PATH REMOVED...\bin\Debug\netcoreapp1.1\xunit.runner.visualstudio.dotnetcore.testadapter.dll does not exist on disk
2017.08.04 16:58:43.304   ERROR Transition failed: Transition from state <HandShake> on event <remote::.ProtocolVersion>. Cause: System.InvalidOperationException: Test-cases are missing for the selected tests. Did discovery succeed? at JetBrains.ReSharper.UnitTestFramework.DotNetCore.DotNetVsTest.DotNetVsTestExecution.SendGetProcessStartInfo() at Appccelerate.StateMachine.Machine.ActionHolders.ArgumentLessActionHolder.Execute(Object argument) at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryAction(IActionHolder actionHolder, ITransitionContext`2 context)

--- EXCEPTION #1/1 [LoggerException]
Message = “
  Transition failed: Transition from state <HandShake> on event <remote::.ProtocolVersion>.
  Cause: System.InvalidOperationException: Test-cases are missing for the selected tests. Did discovery succeed?
     at JetBrains.ReSharper.UnitTestFramework.DotNetCore.DotNetVsTest.DotNetVsTestExecution.SendGetProcessStartInfo()
     at Appccelerate.StateMachine.Machine.ActionHolders.ArgumentLessActionHolder.Execute(Object argument)
     at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryAction(IActionHolder actionHolder, ITransitionContext`2 context)
”
ExceptionPath = Root
ClassName = JetBrains.Util.LoggerException
HResult = COR_E_APPLICATION=80131600
StackTraceString = “
  at JetBrains.ReSharper.UnitTestFramework.DotNetCore.DotNetVsTest.DotNetVsTestProtocol.<.ctor>b__e(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.States.State`2.EnterShallow(ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.States.State`2.EnterHistoryNone(ITransitionContext`2 context)
     at Appccelerate.StateMachine.Machine.States.State`2.EnterByHistory(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.PassiveStateMachine`2.ProcessQueuedEvents()
     at Appccelerate.StateMachine.PassiveStateMachine`2.Execute()
     at Appccelerate.StateMachine.PassiveStateMachine`2.Fire(TEvent eventId, Object eventArgument)
     at JetBrains.ReSharper.UnitTestFramework.DotNetCore.Channel.DotNetCoreMessageListener.<>c__DisplayClass2`1.<RegisterMessage>b__1(JToken payload)
     at JetBrains.ReSharper.UnitTestFramework.DotNetCore.Channel.DotNetCoreMessageListener.OnMessage(String rawMessage)
     at JetBrains.ReSharper.UnitTestFramework.DotNetCore.Channel.DotNetCoreRemoteChannel.ReaderThreadProc()
     at JetBrains.ReSharper.TaskRunnerFramework.RemoteChannelBase.<Start>b__0(Object _)
     at System.Threading.QueueUserWorkItemCallback.WaitCallback_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.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
     at System.Threading.ThreadPoolWorkQueue.Dispatch()
     at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
”

2017.08.04 16:58:43.306   ERROR Run: 28147df6-3156-4f24-bd5a-ca737ab6c43a - Faulted
2017.08.04 16:58:43.306   ERROR System.AggregateException: One or more errors occurred. ---> System.InvalidOperationException: Test-cases are missing for the selected tests. Did discovery succeed?
   at JetBrains.ReSharper.UnitTestFramework.DotNetCore.DotNetVsTest.DotNetVsTestExecution.SendGetProcessStartInfo()
   at Appccelerate.StateMachine.Machine.ActionHolders.ArgumentLessActionHolder.Execute(Object argument)
   at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryAction(IActionHolder actionHolder, ITransitionContext`2 context)
   --- End of inner exception stack trace ---
   at JetBrains.ReSharper.UnitTestFramework.Launch.Stages.RunTestsStage.<>c__DisplayClassc.<StartSingleRun>b__8()
---> (Inner Exception #0) System.InvalidOperationException: Test-cases are missing for the selected tests. Did discovery succeed?
   at JetBrains.ReSharper.UnitTestFramework.DotNetCore.DotNetVsTest.DotNetVsTestExecution.SendGetProcessStartInfo()
   at Appccelerate.StateMachine.Machine.ActionHolders.ArgumentLessActionHolder.Execute(Object argument)
   at Appccelerate.StateMachine.Machine.States.State`2.ExecuteEntryAction(IActionHolder actionHolder, ITransitionContext`2 context)<---

2017.08.04 16:58:43.306   TRACE Processed message 'ProtocolVersion'
2017.08.04 16:58:43.306    INFO RunTestsStage completed
2017.08.04 16:58:43.307    INFO Finishing run
2017.08.04 16:58:43.316    INFO Run is finished

My Nuget imports are:

<ItemGroup>
  <PackageReference Include="Microsoft.Extensions.DependencyModel" Version="1.1.2" />
  <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
  <PackageReference Include="Microsoft.NETCore.Portable.Compatibility" Version="1.0.1" />
  <PackageReference Include="System.Runtime.InteropServices.WindowsRuntime" Version="4.3.0" />
  <PackageReference Include="System.ServiceModel.Http" Version="4.3.0" />
  <PackageReference Include="xunit" Version="2.2.0" />
  <PackageReference Include="xunit.runner.console" Version="2.2.0" />
</ItemGroup>

Answer 1

The error is in my choice of Nuget packages to import.

Instead of:

<PackageReference Include="xunit.runner.console" Version="2.2.0" />

I should have had:

<PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />

You'll probably need a rebuild or turn Visual Studio off and on again after this.