RSpec matcher/macro to detect if a module is included in another module or class.

should_include_module_macro.rb

module CustomMacros
  def it_should_include_module(expected)
    it "should include #{expected}" do
      should include_module(expected)
    end
  end
  
  def it_should_not_include_module(expected)
    it "should not include #{expected}" do
      should_not include_module(expected)
    end
  end
end

should_include_module_matcher.rb

module CustomMatchers
  def include_module(expected)
    simple_matcher("should include module #{expected}") do |actual| 
      module_name = expected.to_s.camelize
      actual.class.included_modules.include?(module_name.constantize)
    end
  end
end