Unit testing in Chef with ChefSpec example

Let's suppose that we have the following coookbook -
recipes/server.rb:

package 'apache2'

template '/var/www/html/index.html' do
  source 'index.html.erb'
  variables(:name => "Dmitri") 
end

service 'apache2' do
  action [:enable, :start ]
  subscribes :restart, 'template[/var/www/html/index.html]', :immediately
end

Unit testing is executed from these files -
spec/spec_helper.rb:

require 'chefspec'
require 'chefspec/berkshelf'

ChefSpec::Coverage.start!

spec/unit/recipes/default_spec.rb:

require 'spec_helper'

describe 'apache::default' do
  context 'When all attributes are default, on an unspecified platform' do
    let(:chef_run) do
      runner = ChefSpec::ServerRunner.new({:platform => 'centos', :version => '7.0'})
      runner.converge(described_recipe)
    end

    it 'installs the correct package' do
      expect(chef_run).to install_package('apache2')
    end

    it 'creates an default html file' do
      expect(chef_run).to create_template('/var/www/html/index.html')
    end

    it 'starts the service' do
      expect(chef_run).to start_service('apache2')
    end
    
    it 'starts the service' do
      expect(chef_run).to enable_service('apache2')
    end
  end
end

Execute the tests in following way:

chef exec rspec spec/unit/recipes/default_spec.rb

Example output:

....

Finished in 0.37569 seconds (files took 0.97682 seconds to load)
4 examples, 0 failures


ChefSpec Coverage report generated...

  Total Resources:   3
  Touched Resources: 3
  Touch Coverage:    100.0%

You are awesome and so is your test coverage! Have a fantastic day!