When you create a test project from scratch the test run configuration file is automatically added by the project template, but if the test project is created by the ASP.NET MVC web application project template it’s not. And if you want to enable Code Coverage you have to it manually.
It took me a while to find out how to add a test run configuration to a test project. The problem was: it cannot be added to the test project, but must be added as Solution Item to the solution that contains it.
Maybe the ASP.NET MVC team could consider adding the test run config file also in their project template.