Implement playlist edit feature

* Display playlists as links in index
* Move playlist form in a partial

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

@@ -0,0 +1,27 @@
+require 'spec_helper'
+
+describe 'playlists/edit.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 edit 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