controller_spec.rb

describe "PUT update" do
    describe "with valid params" do
      it "updates the requested article" do
        article = Article.create! valid_attributes
        Article.any_instance.should_receive(:update).with({ "these" => "params" })
        put :update, {:id => article.to_param, :article => { "these" => "params" }}, valid_session
      end

      it "assigns the requested article as @article" do
        article = Article.create! valid_attributes
        put :update, {:id => article.to_param, :article => valid_attributes}, valid_session
        assigns(:article).should eq(article)
      end

      it "redirects to the article" do
        article = Article.create! valid_attributes
        put :update, {:id => article.to_param, :article => valid_attributes}, valid_session
        response.should redirect_to(article)
      end
    end
    
    
    ...
    
    
    it "re-renders the 'edit' template" do
        article = Article.create! valid_attributes
        # Trigger the behavior that occurs when invalid params are submitted
        Article.any_instance.should_receive(:save).and_return(false)
        put :update, {:id => article.to_param, :article => invalid_attributes }, valid_session
        response.should render_template("edit")
    end

output_of_controller_spec.rb

ailures:

  1) ArticlesController PUT update with valid params updates the requested article
     Failure/Error: put :update, {:id => article.to_param, :article => { "these" => "params" }}, valid_session
       #<Article:0x007fea0814ae70> received :update with unexpected arguments
         expected: ({"these"=>"params"})
              got: ({})
     # ./app/controllers/articles_controller.rb:39:in `block in update'
     # ./app/controllers/articles_controller.rb:38:in `update'
     # ./spec/controllers/articles_controller_spec.rb:112:in `block (4 levels) in <top (required)>'

  2) ArticlesController PUT update with valid params redirects to the article
     Failure/Error: put :update, {:id => article.to_param, :article => valid_attributes}, valid_session
       The message 'update' was received by #<Article id: 108, name: "MyArticleName", presentation_date: nil, journal: "MyJournal", publication_date: nil, presentation_comments:
nil, created_at: "2013-10-18 19:15:52", updated_at: "2013-10-18 19:15:52", user_id: nil> but has already been received by
     # ./app/controllers/articles_controller.rb:39:in `block in update'
     # ./app/controllers/articles_controller.rb:38:in `update'
     # ./spec/controllers/articles_controller_spec.rb:123:in `block (4 levels) in <top (required)>'
     
  3) ArticlesController PUT update with valid params assigns the requested article as @article
     Failure/Error: put :update, {:id => article.to_param, :article => valid_attributes}, valid_session
       The message 'update' was received by #<Article id: 109, name: "MyArticleName", presentation_date: nil, journal: "MyJournal", publication_date: nil, presentation_comments:
nil, created_at: "2013-10-18 19:15:52", updated_at: "2013-10-18 19:15:52", user_id: nil> but has already been received by
     # ./app/controllers/articles_controller.rb:39:in `block in update'
     # ./app/controllers/articles_controller.rb:38:in `update'
     # ./spec/controllers/articles_controller_spec.rb:117:in `block (4 levels) in <top (required)>'
     
     
  5) ArticlesController PUT update with invalid params re-renders the 'edit' template
     Failure/Error: put :update, {:id => article.to_param, :article => invalid_attributes }, valid_session
       The message 'update' was received by #<Article id: 111, name: "MyArticleName", presentation_date: nil, journal: "MyJournal", publication_date: nil, presentation_comments: nil, created_at: "2013-10-18 19:15:52", updated_at: "2013-10-18 19:15:52", user_id: nil> but has already been received by
     # ./app/controllers/articles_controller.rb:39:in `block in update'
     # ./app/controllers/articles_controller.rb:38:in `update'
     # ./spec/controllers/articles_controller_spec.rb:141:in `block (4 levels) in <top (required)>'