Start Mock Server

πŸ‘¨β€πŸ’Ό Since we have the mock server going, our OAuth integration mocks in will handle requests made by the remix-auth-github during our tests. But that's just got our happy-path stuff. We need to test the unhappy-path stuff too. Let's get to that next.
πŸ§β€β™‚οΈ I'm going to add another utility for us called assertToastSent. Basically, there are several spots in where we redirect the user and pop up a toast for them. We want to test that functionality. You can write it yourself if you like (check out for how it works), or you can check my changes.