[root@puppet classes]# cat opt_spec.rb

require 'spec_helper'

shared_examples_for 'test /opt existence' do

        it do
          should contain_file('/opt').with(
            :ensure => 'directory',
            :mode   => '0755',
            :owner  => 'root',
            :group  => 'root',
            :before => "Notify[The 'opt' directory exist for Ubuntu & Centos servers.]" )

        end
            it { should contain_notify("The 'opt' directory exist for Ubuntu & Centos servers.") }

                  context 'centos' do
                       let(:facts) {{ :operatingsystem => 'Centos' }}
                          it_should_behave_like 'test /opt existence'
                       end

                  context 'redhat' do
                       let(:facts) {{ :operatingsystem => 'RedHat' }}
                          it_should_behave_like 'test /opt existence'
                       end

		  context 'other' do
      		       let(:facts) {{ :operatingsystem => 'Ubuntu' }}
            		  it { should_not contain_file('/op') }
      		       end
end