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

• It makes mocking easier
• They usually allow you to express testable assertions that refer to the interaction between objects.

Here you have an example:

var extension = MockRepository
    .GenerateMock>();
  var ctx = new StandardContext();
  ctx.AddExtension(extension);
  extension.AssertWasCalled(
    e=>e.Attach(null), 
    o=>o.Constraints(Is.Equal(ctx)));

You can see that I explicitly test that the Attach method of the IContextExtension was called and that the input parameter was said context object. It would make my test fail if that did not happen.