Testing a template with rspec-puppet

puppet-template.rb

require 'spec_helper'

describe 'foo' do
  on_supported_os.each do |os, os_facts|
    context "on #{os}" do
      let(:facts) { os_facts }

      describe 'foo equals bar' do
        let(:pre_condition) do
          'class {"::foo":
             foo => "bar",
          }'
        end

        it { is_expected.to compile }
        it { is_expected.to contain_file('/etc/foo.yml') }
        it {
          yml_file_content = "---
foo: bar
"
          is_expected.to contain_file('/etc/foo.yml').with(
            content: yml_file_content,
          )
        }
      end
    end
  end
end