Add track/{new,create} with file upload for the track

spec/models/track_spec.rb

@@ -15,4 +15,24 @@ describe Track do
 
     it { should_not be_valid }
   end
+
+  describe '#uploaded_file=' do
+    let(:track) { Track.new :name => 'Mega song' }
+
+    it 'saves an uploaded file' do
+      filepath = "#{Rails.root}/spec/fixtures/test.mp3"
+      file = mock(Rack::Test::UploadedFile)
+      file.stub(
+        :tempfile     => File.new(filepath),
+        :content_type => 'audio/mpeg'
+      )
+      track.uploaded_file = file
+      track.save
+      File.read("#{Rails.root}/data/tracks/#{track.id.to_s}").should == File.read(filepath)
+    end
+
+    after do
+      `rm -rf #{Rails.root}/data/tracks/*`
+    end
+  end
 end