Add rspec and split out models.

Gemfile

@@ -6,6 +6,15 @@ gem 'foreman'
 
 gem 'ruby-mpd'
 
+group :development, :test do
+  gem 'pry'
+end
+
+group :test do
+  gem 'rspec'
+  gem 'rspec-mocks'
+end
+
 group :development do
   gem 'shotgun'
 end

Gemfile.lock

@@ -2,18 +2,33 @@ GEM
   remote: https://rubygems.org/
   specs:
     backports (3.3.3)
+    coderay (1.0.9)
     daemons (1.1.9)
+    diff-lcs (1.2.4)
     dotenv (0.8.0)
     eventmachine (1.0.3)
     foreman (0.63.0)
       dotenv (>= 0.7)
       thor (>= 0.13.6)
+    method_source (0.8.2)
     multi_json (1.7.9)
+    pry (0.9.12.2)
+      coderay (~> 1.0.5)
+      method_source (~> 0.8)
+      slop (~> 3.4)
     rack (1.5.2)
     rack-protection (1.5.0)
       rack
     rack-test (0.6.2)
       rack (>= 1.0)
+    rspec (2.14.1)
+      rspec-core (~> 2.14.0)
+      rspec-expectations (~> 2.14.0)
+      rspec-mocks (~> 2.14.0)
+    rspec-core (2.14.5)
+    rspec-expectations (2.14.2)
+      diff-lcs (>= 1.1.3, < 2.0)
+    rspec-mocks (2.14.3)
     ruby-mpd (0.2.4)
     shotgun (0.9)
       rack (>= 1.0)
@@ -28,6 +43,7 @@ GEM
       rack-test
       sinatra (~> 1.4.0)
       tilt (~> 1.3)
+    slop (3.4.6)
     thin (1.5.1)
       daemons (>= 1.0.9)
       eventmachine (>= 0.12.6)
@@ -40,6 +56,9 @@ PLATFORMS
 
 DEPENDENCIES
   foreman
+  pry
+  rspec
+  rspec-mocks
   ruby-mpd
   shotgun
   sinatra

models/album.rb

@@ -0,0 +1,26 @@
+require './models/mpd_connection'
+
+class Album
+  attr_accessor :title, :genre, :year
+
+  def initialize(album)
+    first_song = MPDConnection.mpd.search(:album, album).first
+    @title = first_song.album
+    @genre = first_song.genre
+    @year  = first_song.date
+  end
+
+  def self.by_artist(artist)
+    MPDConnection.mpd.albums(artist).map { |album| Album.new(album) }
+  end
+
+  def <=>(album)
+    year <=> album.year
+  end
+
+  def attributes
+    { title: @title,
+      genre: @genre,
+      year: @year }
+  end
+end

models/mpd_connection.rb

@@ -0,0 +1,7 @@
+class MPDConnection
+  def self.mpd
+    @@mpd ||= MPD.new
+    @@mpd.connect unless @@mpd.connected?
+    @@mpd
+  end
+end

mpd_client.rb

@@ -1,9 +1,12 @@
-require 'sinatra'
-require "sinatra/namespace"
+require 'bundler'
+ENV['RACK_ENV'] ||= 'development'
+Bundler.require(:default, ENV['RACK_ENV'])
+
 require 'json'
-require 'ruby-mpd'
 require 'cgi'
 
+require './models/album'
+
 class MPDClient < Sinatra::Base
   register Sinatra::Namespace
 
@@ -55,9 +58,7 @@ class MPDClient < Sinatra::Base
   end
 
   def mpd
-    @mpd ||= MPD.new
-    @mpd.connect unless @mpd.connected?
-    @mpd
+    MPDConnection.mpd
   end
 
 end

spec/models/album_spec.rb

@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+describe Album do
+
+  let(:song1) { MPD::Song.new({ album: 'Back in Black', genre: 'Rock', date: '1980' }) }
+  let(:song2) { MPD::Song.new({ album: 'Highway to Hell', genre: 'Rock', date: '1979' }) }
+
+  before do
+    MPDConnection.mpd.stub(:albums).and_return([song1.album, song2.album])
+    MPDConnection.mpd.stub(:search).and_return([song1, song2])
+    MPDConnection.mpd.stub(:search).with(:album, song1.album).and_return([song1])
+    MPDConnection.mpd.stub(:search).with(:album, song2.album).and_return([song2])
+  end
+
+  it 'has attributes based on first song' do
+    album = Album.new(song1.album)
+    expect(album.title).to eq(song1.album)
+    expect(album.genre).to eq(song1.genre)
+    expect(album.year).to eq(song1.date)
+  end
+
+  it 'should return a list of albums' do
+    expect(Album.by_artist('AC/DC')).to have(2).items
+  end
+
+  it 'should sort the albums by year' do
+    albums = Album.by_artist('AC/DC')
+    expect(albums.sort.map(&:year)).to eq(['1979', '1980'])
+  end
+
+end

spec/mpd_client_spec.rb

@@ -0,0 +1,8 @@
+require 'spec_helper'
+
+describe MPDClient do
+  it 'should respond to GET' do
+    get '/'
+    expect(last_response.status).to eq(404)
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1,20 @@
+ENV['RACK_ENV'] = 'test'
+
+require File.join(File.dirname(__FILE__), '..', 'mpd_client.rb')
+
+require 'sinatra'
+require 'rack/test'
+
+# setup test environment
+set :environment, :test
+set :run, false
+set :raise_errors, true
+set :logging, false
+
+def app
+  MPDClient
+end
+
+RSpec.configure do |config|
+  config.include Rack::Test::Methods
+end