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

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={})
 post ''index''
 @mock_user ||= mock_model(User, stubs).as_null_object
 end

 def setup
   @user = User.new
 end


controller file

 def index
    @users = User.find(:all)
     end


please give me some help ..

thanks
Yennie

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