All helpers are included in helper object for helper specs, despite clear_helpers

It seems that the "helper" object inside helper specs has all helper modules included into it, despite having clear_helpers in ApplicationController.

I setup a small test app using rails 3.0.5, rspec-rails 2.5. In it, I edited my ApplicationController to call "clear_helpers."

I then created two helpers:

app/helpers/bar_helper.rb:

module BarHelper
  def bar
    "I am the bar helper"
  end
end

app/helpers/foo_helper.rb:

module FooHelper
  def bar
    "I am the foo helper"
  end
end

Then I setup the following spec in spec/helpers/bar_helper_spec.rb:

require "spec_helper"

describe BarHelper do
  it "should be the bar helper" do
    helper.bar.should == "I am the bar helper"
  end
end

When run, it fails with:

Failures:

  1) BarHelper should be the bar helper
     Failure/Error: helper.bar.should == "I am the bar helper"
       expected: "I am the bar helper"
            got: "I am the foo helper" (using ==)
     # ./spec/helpers/bar_helper_spec.rb:5

It seems that FooHelper is included in the helper object. Is there any way to "clear_helpers" for rspec's helper object?

Thanks!