http://dewey.ws/blog/2012/04/02/infrastructure-testing-with-minitest/

Gemfile

source "http://rubygems.org"

group :test, :development do
  gem "rake", "~> 0.9.2.2"
  gem "rye",  "~> 0.9.5"
end

setup_chef_test.rb

require "test_helper"

describe "setup_chef" do
  it "has config" do
    topic = Rbox.execute "ls /etc/chef/client.rb"

    topic.exit_status.must_equal 0
  end 

  it "has first-boot json" do
    topic = Rbox.execute "ls /etc/chef/first-boot.json"

    topic.exit_status.must_equal 0
  end 

  it "has proper initial role" do
    topic = Rbox.execute "cat /etc/chef/first-boot.json |grep run_list"

    topic.to_s.must_equal '{"run_list":["role[booted]"]}'
  end 

  it "has initial chef-client crontab" do
    topic = Rbox.execute "crontab -l |grep chef-client"

    topic.to_s.must_match %r{0,30.*chef-client}
  end

  describe "validation.pem" do
    before { @file = "/etc/chef/validation.pem" }
    
    it "exists" do
      topic = Rbox.execute "ls #{@file}"

      topic.exit_status.must_equal 0
    end
    
    it "has proper modes" do
      topic = Rbox.sudo "perl -e'printf \"%o\n\",(stat shift)[2] & 07777' #{@file}"

      topic.stdout.to_s.to_i.must_equal 600 
    end
  end

  describe "data bag secret" do
    before { @file = "/etc/chef/encrypted_data_bag_secret" }

    it "exists" do
      topic = Rbox.execute "ls #{@file}"

      topic.exit_status.must_equal 0
    end

    it "has proper modes" do
      topic = Rbox.sudo "perl -e'printf \"%o\n\",(stat shift)[2] & 07777' #{@file}"

      topic.stdout.to_s.to_i.must_equal 600
    end
  end
end

test_helper.rb

require "rubygems"
require "bundler"

Bundler.setup :default, :test

require "rye"
require "minitest/spec"

MiniTest::Unit.autorun

Rbox = Rye::Box.new(ENV['TEST_HOST'],
  :via  => Rye::Hop.new("jumphost.example.com"),
  :user => ENV['TEST_USER']
)
Rbox.disable_safe_mode