Add files

Dockerfile

+FROM ruby:2.4.1-alpine
+ADD ./ /app/
+WORKDIR /app
+ENV PORT 5000
+EXPOSE 5000
+
+CMD ["sh", "-c", "while :; do ruby ./server.rb; done"]

Gemfile

+source 'https://rubygems.org'
+ruby '2.4.1'
+
+gem 'minitest', '~> 5.10.2', group: :test
+gem 'rake'

Gemfile.lock

+GEM
+  remote: https://rubygems.org/
+  specs:
+    minitest (5.10.2)
+    rake (12.0.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  minitest (~> 5.10.2)
+  rake
+
+RUBY VERSION
+   ruby 2.4.1p111
+
+BUNDLED WITH
+   1.15.4

codeclimate.json

+[{"categories":["Bug Risk"],"check_name":"TODO","description":"TODO found","location":{"lines":{"begin":8,"end":8},"path":"server.rb"},"type":"issue","engine_name":"fixme","fingerprint":"d307efde33ac46498148e96379df0fc5","severity":"minor"}]

rakefile.rb

+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs.push('.')
+  t.test_files = FileList['test/*_spec.rb']
+  t.verbose = true
+end

server.rb

+require 'webrick'
+require 'securerandom'
+
+server = WEBrick::HTTPServer.new :Port => ENV.fetch('PORT'){ 5000 }
+
+#Return a successful Hello World response.
+server.mount_proc '/' do |_request, response|
+  #TODO: use HTML
+  response.body = 'Hello, world!'
+  sleep 0.125 + SecureRandom.random_number*0.250
+end
+
+#Return an error to help demonstrate monitoring capabilities
+server.mount_proc '/error' do |_request, response|
+  response.status = 500
+  response.body = 'Sorry we encountered an error.'
+  sleep 1.0+SecureRandom.random_number
+end
+
+server.start

test/app_spec.rb

+require 'minitest'
+require 'minitest/spec'
+require 'minitest/autorun'
+
+describe 'minimal-ruby-app' do
+  it 'must be awesome' do
+    true.must_be_same_as(true)
+  end
+end