Rhino Mocks AAA Quick Start?

Question

I\'ve been looking around for some decent information on using Rhino Mocks 3.5+ with the AAA syntax. I find a lot of blogs that have a mix of things from the old and new whi

Answer 1

First make sure you know what you mean for each A in AAA. You may know but I'll include my working definitions for completeness of the answer:

• Arrange is where I set up inputs, mocks/stubs, the object with the method under test
• Act is where I call the method under test
• Assert is where I verify things occurred or didn't according to expectation

I like to put comments in my test code to remind me to think about each of those things. An example may help clarify: Suppose I have a service layer class which uses two provider layer classes, one from an "old" system and one from a "new" system; I am testing that the method which copies old things to the new system calls the "CreateThing" method one time for each old thing found.

[Test]
public void Should_create_new_Thing_for_each_old_Thing()
{
  // -----
  // arrange

  // hardcode results from old system provider
  List oldThings = new List { ... };

  // old system provider
  var oldProvider = MockRepository.GenerateStub();
  oldProvider.Stub(m=>m.GetThings()).Return(oldThings);

  // new system provider
  var newProvider = MockRepository.GenerateStub();

  // service object
  var svc = new MyService(oldProvider, newProvider);

  //-----------
  // act
  var result = svc.CopyThings();

  //------------
  // assert
  oldThings.ForEach(thing => 
                    newProvider.AssertWasCalled(prov => prov.CreateThing(thing)));
}