Rspec mock AAA extension

gistfile1.txt

require 'rspec'

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

describe 'have received matcher' do
  let(:foo) { double.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, 'home')
  end

end

Looks like it hooks up to method_missing, so it will only work on spies or things that are unstubbed. I made some changes and included a failing test: https://gist.github.com/2019573