Filter by configured queue name prefix when fetching queues

That's it, by active_job.config.queue_name_prefix. This is useful when
an adapter has queues from different environments mixed together.

lib/active_job/querying.rb

@@ -22,8 +22,10 @@ def jobs
     private
       def fetch_queues
         queue_adapter.queues.collect do |queue|
-          ActiveJob::Queue.new(queue[:name], size: queue[:size], active: queue[:active], queue_adapter: queue_adapter)
-        end
+          if !queue_name_prefix || queue[:name].start_with?(queue_name_prefix)
+            ActiveJob::Queue.new(queue[:name], size: queue[:size], active: queue[:active], queue_adapter: queue_adapter)
+          end
+        end.compact
       end
   end
 

test/system/list_queues_test.rb

@@ -3,16 +3,35 @@
 class ListQueuesTest < ApplicationSystemTestCase
   setup do
     create_queues *10.times.collect { |index| "queue_#{index}" }
-
-    visit queues_path
   end
 
   test "list queues sorted by name" do
+    visit queues_path
+
     assert_equal 10, queue_row_elements.length
     queue_row_elements.each.with_index do |queue_element, index|
       within queue_element do
         assert_text "queue_#{index}"
       end
     end
   end
+
+  test "list queues sorted by name and filtered by prefix" do
+    with_queue_name_prefix do
+      visit queues_path
+
+      assert_equal 1, queue_row_elements.length
+      within queue_row_elements.first do
+        assert_text "queue_1"
+      end
+    end
+  end
+
+  private
+    def with_queue_name_prefix(&block)
+      previous_prefix, ActiveJob::Base.queue_name_prefix = ActiveJob::Base.queue_name_prefix, "queue_1"
+      yield
+    ensure
+      ActiveJob::Base.queue_name_prefix = previous_prefix
+    end
 end