This video discusses singletons, and when to use them.The Singleton is a well-known pattern in software. It’s got a lot of bad reputation too, since it makes testing more difficult. It has even come to being called “Evil”.

We know that effective automated developer testing is a cornerstone of successful app development. In Visual Studio 2012, we have enabled developers to use modern, agile techniques for developing and testing Windows Store apps written in C#/VB. In this talk, we will demonstrate how to apply existing best practices to effectively test your app in this new world. We also explore how to use highly iterative developer testing techniques like Test-Driven Development to create and test your app, using well-known patterns like MVVM and isolation.

This video explains how to instal ApprovalTests from nuget to use with MsTest framework.

A short tutorial on how to use NUnit with Visual C#.

The only available test framework that’s provided out of the box with ASP.NET MVC 3 is the Visual Studio Unit Test framework. This article, based on chapter 23 of ASP.NET MVC 3 in Action, shows you how to create and install custom test project templates and view engine options.