Fix for https://groups.google.com/forum/#!topic/rspec/T4IApSxAc2E

exit_with_status.rb

require "rspec/exit_matchers/version"

# expect { exit(1) }.to exit_with_status(1)
module RSpec
  module ExitMatchers
    class ExitWithStatus

      def initialize(expected_status)
        @expected_status = expected_status
      end

      def matches?(actual)
        begin
          actual.call
        rescue SystemExit => e
          @exit_status = e.status
        end
        @exit_status && @expected_status == @exit_status
      end

      def failure_message
        "expected block to exit with status #{@expected_status}, but it did not"
      end

      def supports_block_expectations?
        true
      end
    end

    def exit_with_status(expected_status)
      ExitWithStatus.new expected_status
    end
  end
end

RSpec::configure do |config|
  config.include(Rspec::ExitMatchers)
end