Rails 2.1.0 / RSpec 1.1.4 mismatch?

Trying to do a simple controller test with RSpec 1.1.4 on Rails 2.1.0 --

   it "should render index template" do
     do_get
     response.should render_template('index')
   end

:: results in a

1)
NoMethodError in 'GroupsController handling GET /groups should render
index template'
undefined method `rendered_file' for #<ActionController::TestResponse:0x1eb8f60>

Meanwhile, NetBeans shows a deprecation warning with `render_template`, but
changing it to the recommended form:
     response.should render :template => 'index'

:: results in

1)
NoMethodError in 'GroupsController handling GET /groups should render
index template'
undefined method `render' for
#<Spec::Rails::Example::ControllerExampleGroup::Subclass_1::Subclass_1:0x1701ab0>

Anyone seen this before, and/or have any suggestions?

TIA!

H*