Minitest/Spec Sharing Examples / Check if class implements the interface

service_interface.rb

module ServiceInterface
	def self.included(base)
		base.send :include, InstanceMethods
	end

	module InstanceMethods
		def test
			"test"
		end
	end
end

service_interface_spec.rb

require 'spec_helper'

class Module
  def it(description, &block)
    define_method "test_#{description}", &block
  end
end


module TestServiceInterface

  it "should respond to my_test" do
    assert_respond_to(@object, :my_test)
  end

end

test_service.rb

require_relative 'service_interface'

class TestService
	include ServiceInterface

	def my_test
		"my_test"
	end
end

test_service_spec.rb

require 'spec_helper'
require_relative 'service_interface_spec'

describe TestService do
	include TestServiceInterface

	before do
		@object = TestService.new
	end

end