```ruby
require 'rubygems'
require 'bundler/setup'

$:.unshift(File.dirname(__FILE__) + '/../lib')
$:.unshift(File.dirname(__FILE__))

require 'test/unit'
require 'pp'
require 'etl'
require 'shoulda'
require 'flexmock/test_unit'

database_yml = File.dirname(__FILE__) + '/config/database.yml'
ETL::Engine.init(:config => database_yml)
ETL::Engine.logger = Logger.new(STDOUT)
# ETL::Engine.logger.level = Logger::DEBUG
ETL::Engine.logger.level = Logger::FATAL

db = YAML::load(IO.read(database_yml))['operational_database']['adapter']
# allow both mysql2 and mysql adapters
db = db.gsub('mysql2', 'mysql')
raise "Unsupported test db '#{db}'" unless ['mysql', 'postgresql'].include?(db)

require "connection/#{db}/connection"
ActiveRecord::Base.establish_connection :operational_database
ETL::Execution::Job.delete_all

require 'mocks/mock_source'
require 'mocks/mock_destination'

# shortcut to launch a ctl file
def process(file)
  Engine.process(File.join(File.dirname(__FILE__), file))
end

puts "ActiveRecord::VERSION = #{ActiveRecord::VERSION::STRING}"

```

Clean up our test helper
user
```ruby
$:.unshift(File.dirname(__FILE__) + '/../lib')
$:.unshift(File.dirname(__FILE__))

require 'test/unit'
require 'pp'
require 'etl'
require 'shoulda'
require 'flexmock/test_unit'

raise "Missing required DB environment variable" unless ENV['DB']

database_yml = File.dirname(__FILE__) + '/config/database.yml'
ETL::Engine.init(:config => database_yml)
ETL::Engine.logger = Logger.new(STDOUT)
# ETL::Engine.logger.level = Logger::DEBUG
ETL::Engine.logger.level = Logger::FATAL

ActiveRecord::Base.establish_connection :operational_database
ETL::Execution::Job.delete_all

require 'mocks/mock_source'
require 'mocks/mock_destination'

# shortcut to launch a ctl file
def process(file)
  Engine.process(File.join(File.dirname(__FILE__), file))
end

puts "ActiveRecord::VERSION = #{ActiveRecord::VERSION::STRING}"

```
assistant