Using transactional tests with RSpec and DataMapper

spec_helper.rb

require "rubygems"
 
# Add the local gems dir if found within the app root; any dependencies loaded
# hereafter will try to load from the local gems before loading system gems.
if (local_gem_dir = File.join(File.dirname(__FILE__), '..', 'gems')) && $BUNDLE.nil?
  $BUNDLE = true; Gem.clear_paths; Gem.path.unshift(local_gem_dir)
end
 
require "merb-core"
require "spec" # Satisfies Autotest and anyone else not using the Rake tasks
 
# this loads all plugins required in your init file so don't add them
# here again, Merb will do it for you
Merb.start_environment(:testing => true, :adapter => 'runner', :environment => ENV['MERB_ENV'] || 'test')
 
DataMapper.auto_migrate!
 
Spec::Runner.configure do |config|
  config.include(Merb::Test::ViewHelper|>)
  config.include(Merb::Test::RouteHelper|>)
  config.include(Merb::Test::ControllerHelper|>)  
 
  config.after(:each) do
    repository(:default) do
      while repository.adapter.current_transaction
        repository.adapter.current_transaction.rollback
        repository.adapter.pop_transaction
      end
    end
  end
 
  config.before(:each) do
    repository(:default) do
      transaction = DataMapper::Transaction.new(repository)
      transaction.begin
      repository.adapter.push_transaction(transaction)
    end
  end
 
end