module ActionView::TestCase::Behavior

def view

The instance of ActionView::Base that is used by +render+. 
def view
  @view ||= begin
    view = @controller.view_context
    view.singleton_class.send :include, _helpers
    view.extend(Locals)
    view.rendered_views = self.rendered_views
    view.output_buffer = self.output_buffer
    view
  end
end