R# Reports all tests as Inconclusive for project with NUnit 3.12 + NUnit3TestAdapter 3.13 installed

A coworker encountered this today while we were updating test dependencies. All our testing was on Visual Studio 2017, for projects targeting .NET 462.

It seems like, when running tests in R# for a test project with NuGet packages NUnit 3.12 + NUnit3TestAdapter 3.13 installed, R# reports the test status of all tests as inconclusive. We didn’t see this behaviour with NUnit 3.11.2 + NUnitTestAdapter 3.13, or with NUnit 3.12 and no test adapter installed as a NuGet package. It also worked as expected when using the latest version of the VS Extension Test Adapter with NUnit 3.12 + NUnit3TestAdapter 3.13 installed as NuGet packages.

Filing this here because it seems adapter-centric to me. I don’t have specifics on exact versions of R# or VS 2017 used, but VS 2017 is 15.9.*.

[luisdaglez]

@stevenaw you beat me to it by a couple minutes. Reproducible on a brand new from scratch solution. Visual Studio Professional 2017 v15.9.13 ReSharper Ultimate 2018.1 works with 3.11.2, does not work with 3.12.0 and 3.13.0

using NUnit.Framework;

namespace ClassLibrary
{
    public class Class1
    {
        [Test]
        public void Test1()
        {
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="NUnit" version="3.12.0" targetFramework="net462" />
  <package id="NUnit3TestAdapter" version="3.12.0" targetFramework="net462" />
</packages>

[OsirisTerje]

@stevenaw Thanks for your work here!
We then have a link to the existing issue, and I think we can then close this, and keep what you wrote above as documentation for this issue!
Thanks again!