dotcover showing 0% coverage despite tests running through code Follow

I logged this on SO here (https://stackoverflow.com/questions/50283412/resharper-dotcover-showing-0-coverage-despite-tests-running-through-code) but no one has answered yet

I'm assuming this is an error on my part but I can't figure out why ReSharper dotcover is showing my test coverage of certain queries (and commands too) as 0%.

So I have a .NET Core CQRS API that is made up of a lot of EF Core LINQ. Below is a simple example of one of my queries's main execute method (I left out the DI constructor but I'm sure you git the idea):

    public bool Execute(SelectIsReportRequested query)
    {
         var context = _clientDatabase.GetContext(query.DatabaseId);

         var result = (from a in context.Assessments
                       join r in context.Registrations on a.AssessmentId equals r.AssessmentId
                       where a.PublicId == query.ResponseId
                       select r.ReportRequested).SingleOrDefault();

         return result == 1;
    }

Then I have the following test that mocks the various bits and runs the query:

    [TestMethod]
    public void It_should_return_true_if_a_report_has_been_requested_for_the_givenassessment()
    {
        const int assessmentId = 1;
        var responseId = Guid.NewGuid();
        var mockRepository = new Mock<ICViewClientContext>();

        var assessments = new List<Assessments>
        {
            new Assessments { AssessmentId = assessmentId, PublicId = responseId },
        };
         var registrations = new List<Registrations>
         {
            new Registrations { AssessmentId = assessmentId, ReportRequested = 1 },
         };

         mockRepository.Setup(x => x.Registrations).Returns(registrations.AsDbSetMock().Object);
         mockRepository.Setup(x => x.Assessments).Returns(assessments.AsDbSetMock().Object);

         var mockClientDatabase = new Mock<IClientDatabase>();
         mockClientDatabase.Setup(x => x.GetContext(1)).Returns(mockRepository.Object);

         var query = new Queries.Assessments.SelectIsReportRequested(2, responseId);
         var handler = new Queries.Assessments.SelectIsReportRequestedHandler(mockClientDatabase.Object);
         var result = handler.Execute(query);

         Assert.AreEqual(true, result);
     }

The tests passes (and will also fail if I break the logic in the LINQ) or any other logic in the code.

However, running dotcover runs the test, passes it but says that none of it is covered.

I would love to know why because it's really driving me insane and worries me that I've done something completely wrong!