Update specs to new rspec syntax

spec/controllers/tracks_controller_spec.rb

@@ -11,14 +11,14 @@ describe TracksController do
     it 'assigns the requested track as @track' do
       track = FactoryGirl.create(:track)
       get :show, id: track.id.to_s
-      assigns[:track].should == track
+      expect(assigns[:track]).to eq track
     end
   end
 
   describe 'GET new' do
     it 'assigns a new track as @track' do
       get :new
-      assigns[:track].should be_a_new(Track)
+      expect(assigns[:track]).to be_a_new Track
     end
   end
 
@@ -41,23 +41,23 @@ describe TracksController do
 
       it 'redirects to the track page' do
         do_create
-        response.should redirect_to(Track.last)
+        expect(response).to redirect_to Track.last
       end
     end
 
     context 'whith invalid params' do
       before do
-        Track.any_instance.stub(:save).and_return(false)
+        allow_any_instance_of(Track).to receive(:save) { false }
       end
 
       it 'assigns the track as @track' do
         do_create
-        assigns[:track].should be_a_new(Track)
+        expect(assigns[:track]).to be_a_new Track
       end
 
       it 'renders the new template' do
         do_create
-        response.should render_template('new')
+        expect(response).to render_template 'new'
       end
     end
   end