Implement tracks/{show,listen}

spec/models/track_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Track do
+  subject { track }
+  let(:track) { Track.new :name => 'Mega song' }
+
+  context 'with valid attributes' do
+    it { should be_valid }
+  end
+
+  context 'when name empty' do
+    before do
+      track.name = ''
+    end
+
+    it { should_not be_valid }
+  end
+end