Could not load type from assembly error

Question

I have written the following simple test in trying to learn Castle Windsor\'s Fluent Interface:

using NUnit.Framework;
using Castle.Windsor;
using System.Col         


        

Answer 1

I experienced a similar issue in Visual Studio 2017 using MSTest as the testing framework. I was receiving System.TypeLoadException exceptions when running some (not all) unit tests, but those unit tests would pass when debugged. I ultimately did the following which solved the problem:

1. Open the Local.testsettings file in the solution
2. Go to the "Unit Test" settings
3. Uncheck the "Use the Load Context for assemblies in the test directory." checkbox

After taking these steps all unit tests started passing when run.