error_lifecycle.rb

class MyStandardError < StandardError; end
class MyException< Exception; end

class ErrorLifeCycleTester
  attr_reader :inner_attempted, :inner_else, :inner_rescue, :inner_ensure, :inner_ensure_has_time_to_finish, :outer_rescue, :outer_else, :outer_ensure, :outer_ensure_has_time_to_finish

  def subject(error_to_raise, error_to_rescue)

    @inner_attempted = nil
    @inner_else = nil
    @inner_rescue = nil
    @inner_ensure = nil
    @inner_ensure_has_time_to_finish = nil

    @outer_rescue = nil
    @outer_else = nil
    @outer_ensure = nil
    @outer_ensure_has_time_to_finish = nil

    begin
      Timeout.timeout(0.001, error_to_raise){
        begin
          @inner_attempted = true
          nil while true
        rescue error_to_rescue
          @inner_rescue = true
        else
          @inner_else = true
        ensure
          @inner_ensure = true
          t = Time.now; nil while Time.now < t+1
          @inner_ensure_has_time_to_finish = true
        end
      }
    rescue Exception
      @outer_rescue = true
    else
      @outer_else = true
    ensure
      @outer_ensure = true
      t = Time.now; nil while Time.now < t+1
      @outer_ensure_has_time_to_finish = true
    end

    unless !!@outer_else ^ !!@outer_rescue
      raise "something strange happened with the outer_rescue variables"
    end
  end
end