Ensure jobs do not refer to the queue

Jobs pushed to the queue should not contain a reference to it. As the queue
itself cannot be marshalled, and as a consequence of checking the
marshallability of all jobs in the test environment, we can now guarantee this
to be the case in the test environment when using the default TestQueue
implementation.

1 files changed, 15 insertions, 0 deletions

diff --git a/railties/test/application/queue_test.rb b/railties/test/application/queue_test.rb
index e8ee8c5c9f..22d6c20404 100644
--- a/railties/test/application/queue_test.rb
+++ b/railties/test/application/queue_test.rb
@@ -109,6 +109,21 @@ module ApplicationTests
       end
     end
 
+    test "attempting to marshal a queue will raise an exception" do
+      app("test")
+      assert_raises TypeError do
+        Marshal.dump Rails.queue
+      end
+    end
+
+    test "attempting to add a reference to itself to the queue will raise an exception" do
+      app("test")
+      job = {reference: Rails.queue}
+      assert_raises TypeError do
+        Rails.queue.push job
+      end
+    end
+
     def setup_custom_queue
       add_to_env_config "production", <<-RUBY
         require "my_queue"