answer_controller.rb

 class Admin::AnswersController < Admin::AdminController
  helper :answers
  
  def index
    @answers = @site.answers
  end


  def show
    @answer = Answer.find(params[:id])
  end

  def new
    @answer = Answer.new
  end


  def edit
    @answer = Answer.find(params[:id])    
  end


  def create
    @answer = Answer.new(params[:answer])
    @page = @site.pages.find(params[:answer][:page_id])
      if @page.answers << @answer
        redirect_to(admin_site_answers_path(@site), :notice => 'answer was successfully created.') 
      else
        render :action => "new"
      end
  end

  def update
    @answer = Answer.find(params[:id])
    
    if @answer.update_attributes(params[:answer])
      redirect_to(admin_site_answers_path(@answer, :site_id => params[:site_id]), :notice => 'answer was successfully updated.')
    else
      render :action => "edit"
    end

  end

  def destroy
    @answer = Answer.find(params[:id])
    @answer.destroy
    redirect_to(admin_site_answers_url(:site_id => @site.id))
  end
  
  private 
  
  
  
end

answer_controller_spec.rb

  describe "POST create" do
    context "while signed-in as a site specific admin" do
      before(:each) do
        @user = Factory(:user)
        @site.add_site_specific_admin!(@user)
        UserSession.create(@user)
      end

      describe "with valid params" do

        it "creates a new Answer" do
          expect {
            post :create, :answer => Factory.build(:answer, :page_id => @page.id).attributes, :site_id => @site.id
          }.to change(Answer, :count).by(1)
        end

        it "assigns a newly created answer as @answer" do
          post :create, :answer => Factory.build(:answer, :page_id => @page.id).attributes, :site_id => @site.id
          assigns(:answer).should be_a(Answer)
          assigns(:answer).should be_persisted
        end

        it "redirects to the answer list" do
          post :create, :answer => Factory.build(:answer, :page_id => @page.id).attributes, :site_id => @site.id
          response.should redirect_to(admin_site_answers_path(:site_id => @site.id))
        end
      end

      describe "with invalid params" do
        it "assigns a newly created but unsaved answer as @answer" do
          # Trigger the behavior that occurs when invalid params are submitted
          Answer.any_instance.stubs(:save).returns(false)
          post :create, :answer => {}, :site_id => @site.id
          assigns(:answer).should be_a_new(Answer)
        end

        it "re-renders the 'new' template" do
          # Trigger the behavior that occurs when invalid params are submitted
          Answer.any_instance.stubs(:save).returns(false)
          post :create, :answer => {}, :site_id => @site.id
          response.should render_template("new")
        end
      end
    end

error

  1) Admin::AnswersController POST create while signed-in as a site specific admin with invalid params assigns a newly created but unsaved answer as @answer
     Failure/Error: post :create, :answer => {}, :site_id => @site.id
     ActionView::MissingTemplate:
       Missing layout layouts/test with {:handlers=>[:erb, :rjs, :builder, :rhtml, :rxml, :rep], :formats=>[:html], :locale=>[:en, :en]} in view paths "#<RSpec::Rails::ViewRendering::EmptyTemplatePathSetDecorator:0x007f90655924a8>"
     # ./app/controllers/application_controller.rb:90:in `rescue in catch_exceptions'
     # ./app/controllers/application_controller.rb:87:in `catch_exceptions'
     # ./spec/controllers/admin/answers_controller_spec.rb:191:in `block (5 levels) in <top (required)>'