1 files changed, 94 insertions, 0 deletions
diff --git a/actionpack/test/dispatch/routing/concerns_test.rb b/actionpack/test/dispatch/routing/concerns_test.rb
new file mode 100644
index 0000000000..ab4ad6b72e
--- /dev/null
+++ b/actionpack/test/dispatch/routing/concerns_test.rb
@@ -0,0 +1,94 @@
+require 'abstract_unit'
+
+class CommentsController < ActionController::Base
+  def index
+    head :ok
+  end
+end
+
+class ImageAttachmentsController < ActionController::Base
+  def index
+    head :ok
+  end
+end
+
+class RoutingConcernsTest < ActionDispatch::IntegrationTest
+  Routes = ActionDispatch::Routing::RouteSet.new.tap do |app|
+    app.draw do
+      concern :commentable do
+        resources :comments
+      end
+
+      concern :image_attachable do
+        resources :image_attachments, only: :index
+      end
+
+      resources :posts, concerns: [:commentable, :image_attachable] do
+        resource :video, concerns: :commentable
+      end
+
+      resource :picture, concerns: :commentable do
+        resources :posts, concerns: :commentable
+      end
+
+      scope "/videos" do
+        concerns :commentable
+      end
+    end
+  end
+
+  include Routes.url_helpers
+  def app; Routes end
+
+  def test_accessing_concern_from_resources
+    get "/posts/1/comments"
+    assert_equal "200", @response.code
+    assert_equal "/posts/1/comments", post_comments_path(post_id: 1)
+  end
+
+  def test_accessing_concern_from_resource
+    get "/picture/comments"
+    assert_equal "200", @response.code
+    assert_equal "/picture/comments", picture_comments_path
+  end
+
+  def test_accessing_concern_from_nested_resource
+    get "/posts/1/video/comments"
+    assert_equal "200", @response.code
+    assert_equal "/posts/1/video/comments", post_video_comments_path(post_id: 1)
+  end
+
+  def test_accessing_concern_from_nested_resources
+    get "/picture/posts/1/comments"
+    assert_equal "200", @response.code
+    assert_equal "/picture/posts/1/comments", picture_post_comments_path(post_id: 1)
+  end
+
+  def test_accessing_concern_from_resources_with_more_than_one_concern
+    get "/posts/1/image_attachments"
+    assert_equal "200", @response.code
+    assert_equal "/posts/1/image_attachments", post_image_attachments_path(post_id: 1)
+  end
+
+  def test_accessing_concern_from_resources_using_only_option
+    get "/posts/1/image_attachment/1"
+    assert_equal "404", @response.code
+  end
+
+  def test_accessing_concern_from_a_scope
+    get "/videos/comments"
+    assert_equal "200", @response.code
+  end
+
+  def test_with_an_invalid_concern_name
+    e = assert_raise ArgumentError do
+      ActionDispatch::Routing::RouteSet.new.tap do |app|
+        app.draw do
+          resources :posts, concerns: :foo
+        end
+      end
+    end
+
+    assert_equal "No concern named foo was found!", e.message
+  end
+end