docker-container-testing-demo

apache2_spec.rb

require 'spec_helper'

describe package('apache2') do
  it { should be_installed }
end

describe process('apache2') do
  it { should be_running   }
end

describe port(80) do
  it { should be_listening }
end

Dockerfile

FROM debian:jessie

RUN apt-get update && \
    apt-get install -y --no-install-recommends apache2 net-tools && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

RUN mkdir -p /var/lock/apache2

ENV APACHE_RUN_USER    www-data
ENV APACHE_RUN_GROUP   www-data
ENV APACHE_PID_FILE    /var/run/apache2.pid
ENV APACHE_RUN_DIR     /var/run/apache2
ENV APACHE_LOCK_DIR    /var/lock/apache2
ENV APACHE_LOG_DIR     /var/log/apache2
ENV LANG               C

EXPOSE 80

ENTRYPOINT ["/usr/sbin/apache2", "-D", "FOREGROUND"]

Rakefile

require 'rspec'
require 'docker'

images = Dir.glob('images/*').map do |dir|
          File.basename(dir) if File.directory?(dir)
         end.compact

namespace :build do
  desc 'Build all docker images'
  task :all => images

  images.each do |image|
    desc "Build #{image} docker image"
    task image.to_sym do
      Docker::Image.build_from_dir(File.join('images', image), t: image) do |v|
        if (log = JSON.parse(v)) && log.has_key?('stream')
          $stdout.puts log['stream']
        end
      end
    end
  end
end

namespace :test do
  targets = Dir.glob('spec/*').map do |dir|
              File.basename(dir) if File.directory?(dir)
            end.compact
  desc 'Run serverspec for all containers'
  task :all => targets

  targets.each do |target|
    desc "Run serverspec for #{target} containers"
    task target do
      container = Docker::Container.create(Image: target)
      container.start
      ENV['CONTAINER_ID'] = container.id
      specs = Dir.glob("spec/#{target}/*_spec.rb")
      RSpec::Core::Runner.run(specs)
      container.delete(force: true)
    end
  end
end

spec_helper.rb

require 'serverspec'
require 'docker'

set :backend, :docker
set :docker_url, ENV['DOCKER_HOST']
set :docker_container, ENV['CONTAINER_ID']