Rails 3 functional tests with HTTPS routes work alone but fail with rake

I have routes that are constrained to the https prototcol.

scope :constraints => { :protocol => "https" } do
  resource :user_session
end
I have my functional tests set to use https.

require 'test_helper'
class UserSessionsControllerTest < ActionController::TestCase
  def setup
    request.env['HTTPS'] = 'on'
  end
  test "new" do
    get :new
    assert_response :success
  end
end
When I run this functional test by itself it works. When I run all

tests via rake it fails with:

test_new(UserSessionsControllerTest):
ActionController::RoutingError: No route matches {:controller=>"user_sessions", :action=>"new"}
    actionpack (3.0.1) lib/action_dispatch/routing/route_set.rb:424:in `raise_routing_error'
    actionpack (3.0.1) lib/action_dispatch/routing/route_set.rb:406:in `generate'
    actionpack (3.0.1) lib/action_dispatch/routing/route_set.rb:453:in `generate'
    actionpack (3.0.1) lib/action_dispatch/routing/route_set.rb:449:in `generate_extras'
    actionpack (3.0.1) lib/action_dispatch/routing/route_set.rb:445:in `extra_keys'
    actionpack (3.0.1) lib/action_controller/test_case.rb:136:in `assign_parameters'
    actionpack (3.0.1) lib/action_controller/test_case.rb:395:in `process'
    actionpack (3.0.1) lib/action_controller/test_case.rb:343:in `get'
    /test/functional/user_sessions_controller_test.rb:14:in `test_new'
    activesupport (3.0.1) lib/active_support/testing/setup_and_teardown.rb:67:in `__send__'
    activesupport (3.0.1) lib/active_support/testing/setup_and_teardown.rb:67:in `run'
    activesupport (3.0.1) lib/active_support/callbacks.rb:443:in `_run_setup_callbacks'
    activesupport (3.0.1) lib/active_support/testing/setup_and_teardown.rb:65:in `run'
Any ideas?

Thanks.