Unit Testing with Puppet and RSpec

1. Change to the spec directory of the nginx module:

   cd /etc/puppetlabs/code/environments/production/modules/nginx/spec/
   

2. Open the classes/nginx_spec.rb file:

   sudo vim classes/nginx_spec.rb
   

3. Review the existing test. Currently, it is set up to check if the module will compile.

4. Add unit tests to ensure the desired classes are contained:

   describe 'nginx' do
     on_supported_os.each do |os, os_facts|
       context "on #{os}" do
         let(:facts) { os_facts }
   
         it { is_expected.to contain_class('nginx::install') }
         it { is_expected.to contain_class('nginx::config') }
         it { is_expected.to contain_class('nginx::service') }
         it { is_expected.to compile }
       end
     end
   end
   

Add the package-based unit test:

it { is_expected.to contain_package('nginx') }

1. Add the basic service test:

   it { is_expected.to contain_service('nginx') }
   

2. Refine the test by adding the required parameter information:

   it { is_expected.to contain_service('nginx').with(ensure: 'running', enable: true, hasrestart: true) }
   

1. Create a case statement for both distros within the context block:

   case os_facts[:osfamily]
   when 'Debian'
   when 'RedHat'
   end
   

2. Check that the file exists:

   case os_facts[:osfamily]
   when 'Debian'
     it { is_expected.to contain_file('/etc/nginx/nginx.conf').with_source('puppet:///modules/nginx/Debian.conf') }
   when 'RedHat'
     it { is_expected.to contain_file('/etc/nginx/nginx.conf').with_source('puppet:///modules/nginx/RedHat.conf') }
   end
   

   Save and exit.

3. Run the unit test:

   sudo pdk test unit