Test Drive Your Dockerfiles with RSpec and ServerSpec

Dockerfile

FROM ubuntu:14.04
MAINTAINER Mason Fischer <mason@thoughtbot.com>
RUN apt-get update && apt-get install -y nodejs

Dockerfile_spec.rb

require "serverspec"
require "docker"

describe "Dockerfile" do
  image = Docker::Image.build_from_dir('.')

  set :os, family: :debian
  set :backend, :docker
  set :docker_image, image.id

  it "installs the right version of Ubuntu" do
    expect(os_version).to include("Ubuntu 14")
  end

  it "installs required packages" do
    expect(package("nodejs")).to be_installed
  end

  def os_version
    command("lsb_release -a").stdout
  end
end

@tfhartmann : I add this to my specs:

after(:all) do
    @image.remove(:force => true)
end

In the example you build the image only. I assume ServerSpec is starting the container and stopping by the end of the test. How can you pass arguments to the container such as environment variables, commands, volumes, etc?

Hello, this is my version of docker:

$ docker -v                                                                     
Docker version 1.11.1

I can't using rspec and always getting this message:

$ bundle exec rspec spec                                             
No examples found.


Finished in 0.00098 seconds (files took 1.23 seconds to load)
0 examples, 0 failures

this is my directory structure:

$ tree .                                                                          ‹ruby-2.3.0›
.
├── Dockerfile
├── run
└── spec
    └── Dockerfile_spec.rb

1 directory, 3 files