Why do we need mocking frameworks?

Question

I have worked with code which had NUnit test written. But, I have never worked with mocking frameworks. What are they? I understand dependency injection and how it helps to

Answer 1

I first grok'd why I needed a mocking framework when I compared writing test doubles by hand for a set of unit tests (each test needed slightly different behaviour so I was creating subclasses of a base fake type for each test) with using something like RhinoMocks or Moq to do the same work.

Simply put it was much faster to use a framework to generate all of the fake objects I needed rather than writing (and debugging) my own fakes by hand.