Update Dockerfile to install phantomjs, and make guard useful

Closes #4

Author: smoll

Dockerfile

@@ -1,2 +1,17 @@
 FROM ubuntu:14.04
 MAINTAINER Shujon Mollah
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update
+RUN apt-get install -y \
+  wget parallel \
+  ruby ruby-dev \
+  build-essential \
+  fontconfig
+
+RUN mkdir drivers
+RUN wget -q -P drivers https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.7-linux-x86_64.tar.bz2
+RUN tar -C drivers -xjf /drivers/phantomjs-1.9.7-linux-x86_64.tar.bz2
+RUN rm -Rf /drivers/phantomjs-1.9.7-linux-x86_64.tar.bz2
+RUN ln -s /drivers/phantomjs-1.9.7-linux-x86_64/bin/phantomjs /usr/bin/phantomjs
+RUN chmod 755 /usr/bin/phantomjs

Gemfile

@@ -1,17 +1,18 @@
 source "https://rubygems.org"
 
-gem "serverspec"
 gem "docker-api", "~> 1.21.4"
+gem "serverspec"
 gem "specinfra", "2.12.7" # because of https://circleci.com/docs/docker#docker-exec
 # Also read https://workshop.avatarnewyork.com/post/test-docker-images-with-circleci/
 
 group :development do
   gem "guard", "~> 2.12.6"
+  gem "guard-rspec", "~> 4.5.2", require: false
   gem "guard-rubocop", "~> 1.2.0"
   gem "rubocop", "~> 0.32.0"
 end
 
 group :ci do
-  gem "yarjuf", "~> 2.0.0"
   gem "coveralls", "~> 0.8.1", require: false
+  gem "yarjuf", "~> 2.0.0"
 end

Guardfile

@@ -18,3 +18,31 @@ guard :rubocop, cli: ["--auto-correct"] do
   watch(/.+\.rb$/)
   watch(%r{(?:.+/)?\.rubocop\.yml$}) { |m| File.dirname(m[0]) }
 end
+
+# Note: The cmd option is now required due to the increasing number of ways
+#       rspec may be run, below are examples of the most common uses.
+#  * bundler: 'bundle exec rspec'
+#  * bundler binstubs: 'bin/rspec'
+#  * spring: 'bin/rspec' (This will use spring if running and you have
+#                          installed the spring binstubs per the docs)
+#  * zeus: 'zeus rspec' (requires the server to be started separately)
+#  * 'just' rspec: 'rspec'
+
+guard :rspec, cmd: "bundle exec rspec" do
+  require "guard/rspec/dsl"
+  dsl = Guard::RSpec::Dsl.new(self)
+
+  # Feel free to open issues for suggestions and improvements
+
+  # RSpec files
+  rspec = dsl.rspec
+  watch(rspec.spec_helper) { rspec.spec_dir }
+  watch(rspec.spec_support) { rspec.spec_dir }
+  watch(rspec.spec_files)
+
+  watch("Dockerfile") { rspec.spec_dir }
+
+  # Ruby files
+  ruby = dsl.ruby
+  dsl.watch_spec_files_for(ruby.lib_files)
+end

spec/Dockerfile_spec.rb

@@ -22,11 +22,15 @@ def remove(_options = {}); end
     expect(os_version).to include "Ubuntu 14"
   end
 
-  xit "installs required packages" do
-    expect(package("phantomjs")).to be_installed
+  it "installs the right version of phantomjs" do
+    expect(phantomjs_version).to eq "1.9.7"
   end
 
   def os_version
     command("lsb_release -a").stdout
   end
+
+  def phantomjs_version
+    command("phantomjs --version").stdout.strip
+  end
 end