Rails - Jul 2011 - undefined method `assigns' and undefined method `post'

Hi,

I have an error of undefined method.
can anyone help me to solve it.
I follow the tutorial to practicing testing controller of rails, and
now i got stuck with the error.. plz help

error:
undefined method `post'' for
#<Spec::Example::ExampleGroup::Subclass_1:0xb7754114>
undefined method `assigns'' for
#<Spec::Example::ExampleGroup::Subclass_1:0xb785d1b4>

Test file

describe "GET Index" do
  def mock_product(stubs={})
  @mock_user ||= mock_model(User, stubs).as_null_object
  end

  def setup
    @user = User.new
  end



please give me some help ..

thanks
Yennie

    it "assigns all users as @users" do
    @user.stub(:all){[mock_user]}
    assigns(:users).should eq([mock_user])
    end
end

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