gistfile1.rb

context "A user posting to a blog" do
  setup do
    @user = Factory(:user)
    @blog = Factory(:blog)
  end
  
  action do
    post :create, :user_id => @user.id, :id => @blog.id, :post => {:body => "Blah"}
  end
  
  # the body of this block is actually executed after 'setup' but before 'action'
  expect "send a notification to Technorati or whatever" do
    TechnoratiApi.expects(:notify)
  end

  expect "kill a kitten" do
    KittyKiller.expects(:murder_randomly)
  end

  should "put the post into the users's posts" do
    assert @user.posts.include?("Blah") # or whatever
  end
  
  # etc
  
end

gistfile2.txt

How it all runs
------------

three 'tests' are generated:

test: A user posting to a blog should send a notification to Technorati or whatever
  - setup runs
  - Technorati expectation is setup
  - action runs
  - test body is empty
  - expectations are then implicitly handled by mocha as normal

test: A user posting to a blog should kill a kitten
  - setup runs
  - KittyKiller expectation is setup
  - action runs
  - test body is empty
  - expectations are then implicitly handled by mocha as normal

test: A user posting toa blog should put the post into the user's posts
  - setup runs
  - action runs
  - test body runs and assertions are handled by test/unit as normal