NUnit

It is typically a good idea to make integration tests and unit tests in separate projects. Just call the new project, PorjectNameOfTheOneYouAreTesting.UnitTests

Install with Nugget
Principles

Basic
Set Up & Tear Down
Parameters
Ignore Tests

How to test

Non-void Methods
Void Methods
Exception Checks
Events
Private Methods
Verify Method Calls

External Dependencies

Loosely-Coupled
Moq
Interaction-based testing