module ActiveSupport::Testing::Isolation

def self.forking_env?
  !ENV["NO_FORK"] && Process.respond_to?(:fork)
end

def self.included(klass) #:nodoc:
  klass.class_eval do
    parallelize_me!
  end
end

def _run_class_setup      # class setup method should only happen in parent
  @@class_setup_mutex.synchronize do
    unless defined?(@@ran_class_setup) || ENV['ISOLATION_TEST']
      self.class.setup if self.class.respond_to?(:setup)
      @@ran_class_setup = true
    end
  end
end

def run
  serialized = run_in_isolation do
    super
  end
  Marshal.load(serialized)
end