This is a good example for my own reference demonstrating a few things with MixIns, Rspec, and OptionParse * Class Real gets the methods .hallo and .parse_options by dint of a MixIn (with include) * The spec context 'with include' show that the hallo method works w/o needing to be instantiated * The spec context 'with Real' shows how I can stub …

options_spec.rb

module MyModule
  module Utils
    def hallo(options)
      if ( options[:verbose] )
        'hallo'
      else
        'buzz_off'
      end
    end

    def parse_options()
      require 'optparse'

      options = {}
      OptionParser.new do |opts|
        opts.banner = "Usage: example.rb [options]"

        opts.on("-v", "--[no-]verbose", "Run verbosely") do |v|
          options[:verbose] = v
        end
      end.parse!
      options
    end

  end

  class Real
    include Utils
  end 
end

describe MyModule do
  context "with include" do 
    include MyModule::Utils
    it { hallo({}).should == "buzz_off" }
  end

  context "with Real" do
    it "should work" do
      obj = MyModule::Real.new()
      obj.stub(:parse_options).and_return({:verbose=>true})
      opts = obj.parse_options()
      obj.hallo(opts).should == 'hallo'
    end
  end
end