RSpec matcher for delegations

delegate_matcher.rb

# RSpec matcher to spec delegations.
#
# Usage:
#
#     describe Post do
#       it { should delegate(:name).to(:author).with_prefix } # post.author_name
#       it { should delegate(:month).to(:created_at) }
#       it { should delegate(:year).to(:created_at) }
#     end

RSpec::Matchers.define :delegate do |method|
  match do |delegator|
    @method = @prefix ? :"#{@to}_#{method}" : method
    @delegator = delegator
    begin
      @delegator.send(@to)
    rescue NoMethodError
      raise "#{@delegator} does not respond to #{@to}!" 
    end
    @delegator.stub(@to).and_return double('receiver')
    @delegator.send(@to).stub(method).and_return :called
    @delegator.send(@method) == :called
  end

  description do
    "delegate :#{@method} to its #{@to}#{@prefix ? ' with prefix' : ''}"
  end

  failure_message_for_should do |text|
    "expected #{@delegator} to delegate :#{@method} to its #{@to}#{@prefix ? ' with prefix' : ''}"
  end

  failure_message_for_should_not do |text|
    "expected #{@delegator} not to delegate :#{@method} to its #{@to}#{@prefix ? ' with prefix' : ''}"
  end

  chain(:to) { |receiver| @to = receiver }
  chain(:with_prefix) { @prefix = true }

end

This fails if the method is a setter with error:

 Failure/Error: it{ should delegate(:name=).to(:sku_description)}

My fork has updated this gist to RSpec 3.3 version: https://gist.github.com/bparanj/4579700adca0b64e7ca0

Hahah! @txus ! Te veo hasta en la sopa :).

Hello,

Do you have a license that you would like to release this code under?
I spoke with Alec Winograd about his fork-of-Simeon's-fork (yep, 2 down), he's added an MIT License to his modifications.
I have also asked Simeon if he'd like to add a license to his modification, but it would be absolutely wonderful if you could assign a license to your code. [Edit] Simeon Simeonov has replied, and selected the MIT License for his modifications as well. [/Edit]

Thank you, hope all is well.

I'm using this for now but thanks for the original work 👏 ❤️

➡️ https://gist.github.com/purp/fe5f79e878b609560724d6b03242a5df