helper method for testing omniauth strategies with Test::Unit and Shoulda

my_auth_test.rb

require 'test_helper'

class OmniAuth::Strategies::MyAuthTest < Test::Unit::TestCase
  it_should_behave_like_an_oauth_strategy
end

test_helper.rb

# Add this into your test_helper.rb file.
class Test::Unit::TestCase
  def strategy_class
    self.class.name.gsub("Test", "").constantize
  end
  
  def self.it_should_behave_like_an_oauth_strategy()
    
    should "be initializable with only three arguments" do
      assert_nothing_raised do
        strategy_class.new(lambda{|env| [200, {}, ['Hello World']]}, 'key', 'secret')
      end
    end
    
    should 'be initializable with a block' do
      assert_nothing_raised do
        strategy_class.new( lambda{|env| [200, {}, ['Hello World']]}){|s| s.consumer_key = 'abc'}
      end
    end
    
    should 'handle the setting of client options' do
      s = strategy_class.new(lambda{|env| [200, {}, ['Hello World']]}, 'key', 'secret', :client_options => {:abc => 'def'})
      assert s.consumer.options[:abc] == 'def'
    end
    
  end
end