serverspecのpackageリソースはrpmコマンドでテストをする ref: http://qiita.com/ikuwow/items/27b99b6540ee48afa988

file0.txt

$ tree spec/
spec/
├── default
│   └── sample_spec.rb
└── spec_helper.rb

file2.txt

Failures:

  1) Package "vim" should be installed
     On host `default'
     Failure/Error: it { should be_installed }
       expected Package "vim" to be installed
       sudo -p 'Password: ' /bin/sh -c rpm\ -q\ vim
       package vim is not installed

     # ./spec/default/sample_spec.rb:4:in `block (2 levels) in <top (required)>'

file3.txt

$ rpm -qa | grep vim
vim-common-7.2.411-1.8.el6.x86_64
vim-enhanced-7.2.411-1.8.el6.x86_64
vim-minimal-7.2.411-1.8.el6.x86_64

file5.txt

Package "vim-common"
  should be installed

Package "vim-enhanced"
  should be installed

Package "vim-minimal"
  should be installed

Finished in 0.69752 seconds (files took 6.01 seconds to load)
3 examples, 0 failures

sample_spec.rb

require 'spec_helper'

%w{vim-common vim-enhanced vim-minimal}.each do |vim|
    describe package(vim) do
        it { should be_installed }
    end
end