Mocking framework for asp.net core 5.0

I recently installed Visual Studio 2015 and started a project with a web site and a asp class library which will contain the unit tests for the web site. I usually use Moq for mocking but I am no stranger to try a different mocking framework. The problem I am having is that I added Moq as a reference to the unit test project and started using it. Everything seems fine at first until I tried to compile.