Nunit Test project for Xamarin.Forms and to run it .

I am new to xamrin.Forms . I had Xamarin.Forms Solution in fresh MVVM in visual stuio 2015 . I need to test it .

Please guide me how to create Nunit Test Project and How to add My solution to it . After adding how we can test Views , ViewModels , Views in our test project . If any sample projets are help ful .

Please give the step by step .

Thanks & Regards , P V Surendra .