我有以下型号

class Picture < ActiveRecord::Base
  belongs_to :product
  has_attached_file :image
end

class Product < ActiveRecord::Base
  has_many :pictures,:dependent => :destroy
  accepts_nested_attributes_for :pictures,:reject_if => lambda { |p| p[:image].blank? },:allow_destroy => true
end

和一个相当标准的控制器,我猜……

def create
  @product = Product.new(params[:product])
  if @product.save
    redirect_to products_path,:notice => "blah."
  else
    render :action => "new"
  end
end

我将如何进行测试呢？我试过这样的东西,但是我无法让它起作用：

describe ProductsController do
  it "adds given pictures to the product" do
    product = Factory.build(:product)
    product.pictures.build(Factory.attributes_for(:picture))
    post :create,:product => product.attributes
    Product.where(:name => product[:name]).first.pictures.count.should == 1 # or something
  end
end

它可能与属性传递给create action的方式有关,但我怎样才能使它工作？我使用rails 3.1.rc5,但我怀疑这与它为什么不工作有任何关系……

或者你不会测试这个,因为它是基本的轨道功能,并且最有可能在开始时经过良好测试？