module RSpec::Mocks::TestDouble

def method_missing(message, *args, &block)
  if __mock_proxy.null_object?
    case message
    when :to_int        then return 0
    when :to_a, :to_ary then return nil
    end
  end
  __mock_proxy.record_message_received(message, *args, &block)
  begin
    __mock_proxy.null_object? ? self : super
  rescue NameError
    # Required wrapping doubles in an Array on Ruby 1.9.2
    raise NoMethodError if [:to_a, :to_ary].include? message
    __mock_proxy.raise_unexpected_message_error(message, *args)
  end
end