Add basic playlists management

* Index of playlists
* Create a new playlist
* Basic playlist model with mandatory name

spec/controllers/playlists_controller_spec.rb

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+require 'spec_helper'
+
+describe PlaylistsController do
+  def valid_attributes
+    {
+      :name => 'Electro'
+    }
+  end
+
+  describe "GET index" do
+    it 'assigns all playlists as @playlists' do
+      playlist = Playlist.create! valid_attributes
+      get :index
+      assigns[:playlists].should == [playlist]
+    end
+  end
+
+  describe "GET new" do
+    it 'assigns a new playlist as @playlist' do
+      get :new
+      assigns[:playlist].should be_a_new(Playlist)
+    end
+  end
+
+  describe "POST create" do
+    let(:playlist) { mock_model(Playlist).as_null_object }
+
+    before do
+      Playlist.stub(:new).and_return(playlist)
+    end
+
+    it 'creates a new playlist' do
+      Playlist.should_receive(:new).
+        with('name' => 'Electro').
+        and_return(playlist)
+      post :create, :playlist => { 'name' => 'Electro' }
+    end
+
+    it 'saves the playlist' do
+      playlist.should_receive(:save)
+      post :create
+    end
+
+    context 'when the playlist saves successfully' do
+      it 'redirects to the playlists index' do
+        post :create
+        response.should redirect_to(:action => 'index')
+      end
+    end
+
+    context 'when the playlist fails to save' do
+      before do
+        playlist.stub(:save).and_return(false)
+      end
+
+      it 'assigns the playlist as @playlist' do
+        post :create
+        assigns[:playlist].should eq(playlist)
+      end
+
+      it 'renders the new template' do
+        post :create
+        response.should render_template('new')
+      end
+    end
+  end
+end

spec/models/playlist_spec.rb

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+require 'spec_helper'
+
+describe Playlist do
+  subject { playlist }
+  let(:playlist) { Playlist.new :name => 'Electro' }
+
+  context "with valid attributes" do
+    it { should be_valid }
+  end
+
+  context "when name empty" do
+    before do
+      playlist.name = ''
+    end
+
+    it { should_not be_valid }
+  end
+end

spec/views/playlists/index.html.haml_spec.rb

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+require 'spec_helper'
+
+describe 'playlists/index.html.haml' do
+  before do
+    assign :playlists, [
+      double('Playlist', :name => 'Foo'),
+      double('Playlist', :name => 'Bar')
+    ]
+  end
+
+  it 'displays a list of playlists' do
+    render
+    rendered.should have_selector('ul>li', :count => 2)
+    rendered.should have_selector('ul>li', :text => 'Foo')
+    rendered.should have_selector('ul>li+li', :text => 'Bar')
+  end
+
+  it 'displays a link to create a new playlist' do
+    render
+    rendered.should have_selector('a', :text => 'Create playlist')
+  end
+end

spec/views/playlists/new.html.haml_spec.rb

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+require 'spec_helper'
+
+describe 'playlists/new.html.haml' do
+  let(:playlist) do
+    mock_model('Playlist').as_new_record.as_null_object
+  end
+
+  before do
+    assign :playlist, playlist
+  end
+
+  it 'renders a form to create a playlist' do
+    render
+    rendered.should have_selector("form[method=post][action='#{playlists_path}']")
+    rendered.should have_selector('input[type=submit]')
+  end
+
+  it 'renders a text field with a label for the playlists name' do
+    playlist.stub(:name => 'Electro')
+    render
+    rendered.should \
+      have_selector("input[type=text][name='playlist[name]'][value=Electro]")
+    rendered.should \
+      have_selector("label[for=playlist_name]", :text => 'Name')
+  end
+end