Failing RSpec test

gistfile1.rb

    AboutYou.any_instance.stub!(:save).and_return(false) 
    post :create
    assigns[:about_you].should be_new_record
    flash[:notice].should be_nil
    response.should render_template('new')



  def create
    @about_you = current_user.build_about_you(params[:about_you])
    if @about_you.save
      flash[:notice] = "Your details have been saved"
      redirect_to cashflow_path
    else
      render :new
    end
  end