rspec mock association

users_controller.rb

def order
    @user = User.find(:first, :conditions => [ "name = ?",   params[:id] ])

    if not @user
      render :json => { :errors => "User #{@choice} doesn't exist" }, :status => 404
    else
      @orders = @user.orders
      if @orders.empty?
        render :json => { :errors => "No orders" }, :status => 404
      else
        respond_to do |format|
         format.json { render :json => { @orders }
        end
      end
    end
end

users_controller_spec.rb

describe UsersController, "GET order list" do

  context "if user doesn't exist" do
    it "must return user doesn't exist" do
      get :order, {:format => "json", :id => "foo"}

      response.body.should =~ /doesn't exist/
      response.should_not be_ok
    end
  end

  context "if user has no orders" do
    it "must return no orders" do
      @user = User.create!(:id => 1, :name => "foo")

      get :order, {:format => "json", :id => "foo"}

      response.body.should =~ /No orders/
      response.should_not be_ok
    end
  end

  context "if user has orders" do
    it "must return a list of orders" do
      @user  = User.create!(:id => 1, :name => "foo")
      @order = Order.create!(:id => 1, :name => "2345678")

      get :order, {:format => "json", :id => "foo"}

      response.body.should =~ /2345678/
      response.should be_ok
    end
  end

  after(:each) do
    User.destroy_all
    Order.destroy_all
  end

end