System.BadImageFormatException when running XUnit 2.2.0 unit test in VS 2017 against a full .net framework asp.net core project

Info about my setup:

• Resharper 2016.3.2
• XUnit 2.2.0
• VS 2017 RTM
• Test Project .net 4.5.2
• Asp.net Core Project .net 4.5.2

Repo Steps:

1. Create an asp.net core site targeting .net 4.5.2

2. Add a unit test project or class library to the solution and reference the asp.net project

3. Create a xunit Fact test that targets a class in the asp.net project

4. Run the unit test using resharper test runner

Error:

System.BadImageFormatException Could not load file or assembly 'AFAEMS, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format. at AFAEMS.Tests.Class1.return_errors_if_missing_fields()

Notes:

I've done a lot of searching and cannot find any similar issues to this. I can run a unit test with a simple assert that is not targeting the asp.net core class files. I couldn't get the VS test runner to find my xunit tests (maybe b/c resharper test runner is enabled?).

These were things I found but don't indicate how to fix with the new xproj and app.config using MSBuild for VS 2017. https://blogs.msdn.microsoft.com/visualstudioalm/2016/05/30/announcing-mstest-framework-support-for-net-core-rc2-asp-net-core-rc2/

Testing Asp.Net Core on full .NET framework

https://github.com/dotnet/sdk/issues/926