Issue while testing a Rails Engine

config-routes.rb

Shim::Engine.routes.draw do
  match "*id" => 'pages#show', :as => :page, :format => false
  root :to => 'pages#show', :id => "index"
end

test output

Run options: 

# Running tests:

EE.

Finished tests in 0.268438s, 11.1758 tests/s, 3.7253 assertions/s.

  1) Error:
test_index_route(RoutesTest):
ActionController::RoutingError: No route matches "/shim"
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/routing/route_set.rb:633:in `recognize_path'
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/testing/assertions/routing.rb:210:in `recognized_request_for'
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/testing/assertions/routing.rb:42:in `assert_recognizes'
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/testing/assertions/routing.rb:118:in `assert_routing'
    /Users/cwoodcox/Projects/shim/test/integration/routing_test.rb:5:in `test_index_route'

  2) Error:
test_page_route(RoutesTest):
ActionController::RoutingError: No route matches "/shim/some-page"
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/routing/route_set.rb:633:in `recognize_path'
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/testing/assertions/routing.rb:210:in `recognized_request_for'
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/testing/assertions/routing.rb:42:in `assert_recognizes'
    /Users/cwoodcox/.rvm/gems/ruby-1.9.3-p194@shim/gems/actionpack-3.2.5/lib/action_dispatch/testing/assertions/routing.rb:118:in `assert_routing'
    /Users/cwoodcox/Projects/shim/test/integration/routing_test.rb:9:in `test_page_route'

3 tests, 1 assertions, 0 failures, 2 errors, 0 skips
rake aborted!
Command failed with status (2): [/Users/cwoodcox/.rvm/rubies/ruby-1.9.3-p19...]

test-dummy-config-routes.rb

Rails.application.routes.draw do
  mount Shim::Engine => "/shim"
end

test-integration-routing_test.rb

require 'test_helper'

class RoutesTest < ActionDispatch::IntegrationTest
  def test_index_route
    assert_routing "/shim", { :controller => "pages", :action => "show", :id => "index" }
  end
  
  def test_page_route
    assert_routing "shim/some-page", { :controller => "pages", :action => "show", :id => "some-page" }
  end
end