Rspec mock AAA extension

gistfile1.rb

require 'rspec'

# is it really this simple?
RSpec::Matchers.define :have_received do |method_name|
  match do |actual|
    @args ||= []
    @method_name ||= method_name
    actual.received_message?(@method_name, *@args)
  end

  def with(*args)
    @args = args
    self
  end
end

describe 'have received matcher' do
  let(:foo) { stub.as_null_object }

  it 'allows arrange, act, assert syntax' do
    foo.go
    foo.should have_received :go
  end

  it 'matches arguments' do
    foo.go 'home'
    foo.should have_received(:go).with('home')
  end

  it 'works with should_not' do
    foo.should_not have_received :go
  end

  # fails
  it 'works on already stubbed methods' do
    foo.stub :go => true
    foo.go
    foo.should have_received :go
  end

end