Rails - Jun 2012 - Having difficulty testing redirects with Rspec and Capybara

Every time I try to test a redirect, I get this error:  @request must be an 
ActionDispatch::Request

Any idea why? I''m using Rspec-Rails 2.9.0, Capybara 1.1.2, and Rails
3.2.
Here''s my test:

describe "AdminAccountPages" do
  subject { page }

  let(:user)    { FactoryGirl.create(:user) }
  let(:account) { user.owned_accounts.create!(name: "ACME Corp",
subdomain:
"acme") }

  describe "Admin::Accounts#show" do

    context "as non-signed in user" do
      before do
        visit admin_account_url(account, host: get_host(account))
      end

      it "should redirect to the login page" do
        assert_redirected_to signin_path
      end
    end
  end
end

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