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

spec/controllers/tracks_controller_spec.rb

@@ -14,4 +14,58 @@ describe TracksController do
       assigns[:track].should == track
     end
   end
+
+  describe 'GET new' do
+    it 'assigns a new track as @track' do
+      get :new
+      assigns[:track].should be_a_new(Track)
+    end
+  end
+
+  describe 'POST create' do
+    let(:track) { mock_model(Track).as_null_object }
+    before { Track.stub(:new).and_return(track) }
+
+    it 'creates a new track' do
+      Track.should_receive(:new).
+        with(:name => 'Mega song').
+        and_return(track)
+      post :create, :track => valid_attributes
+    end
+
+    it 'saves the track' do
+      track.should_receive(:save)
+      post :create, :track => {}
+    end
+
+    it 'saves the file uploaded for the track' do
+      file = mock(Rack::Test::UploadedFile)
+      track.should_receive(:uploaded_file=).with(file)
+      post :create, :track => { :file => file }
+    end
+
+    context 'when the track saves successfully' do
+      it 'redirects to the track page' do
+        post :create, :track => valid_attributes
+        response.should redirect_to(track)
+      end
+    end
+
+    context 'when the track fails to save' do
+      before do
+        track.stub(:save).and_return(false)
+      end
+
+      it 'assigns the track as @track' do
+        post :create, :track => {}
+        assigns[:track].should == track
+      end
+
+      it 'renders the new template' do
+        post :create, :track => {}
+        response.should render_template('new')
+      end
+    end
+
+  end
 end