gistfile1.rb

# There is no message object in the first example, and there needs to be one 
# for the code in the action to run. 

def create
  message = Message.new(params[:message])
  message.save
  redirect_to :action => "index"
end

# We can get the first example to pass without impacting the second example by 
# introducing a mock message: 

it "creates a new message" do 
  message = mock_model(Message) 
  Message.should_receive(:new).with(
    "text" => "a quick brown fox"
  ).and_return(message) 
  post :create, :message => { "text" => "a quick brown fox" } 
end 

# Here we create a mock message and then tell the Message class to return it 
# in response to new( ).