Fix leaky `only: …` option for Active Job assertions

The filter was set on the pseudo-global TestAdapter but not restored to
its original value.

See e818f657

activejob/lib/active_job/test_helper.rb

@@ -13,6 +13,7 @@ def before_setup
         clear_performed_jobs
         queue_adapter.perform_enqueued_jobs = false
         queue_adapter.perform_enqueued_at_jobs = false
+        queue_adapter.filter = nil
         super
       end
 
@@ -253,15 +254,20 @@ def assert_performed_with(args = {}, &_block)
       end
 
       def perform_enqueued_jobs(only: nil)
-        @old_perform_enqueued_jobs = queue_adapter.perform_enqueued_jobs
-        @old_perform_enqueued_at_jobs = queue_adapter.perform_enqueued_at_jobs
-        queue_adapter.perform_enqueued_jobs = true
-        queue_adapter.perform_enqueued_at_jobs = true
-        queue_adapter.filter = only
-        yield
-      ensure
-        queue_adapter.perform_enqueued_jobs = @old_perform_enqueued_jobs
-        queue_adapter.perform_enqueued_at_jobs = @old_perform_enqueued_at_jobs
+        old_perform_enqueued_jobs = queue_adapter.perform_enqueued_jobs
+        old_perform_enqueued_at_jobs = queue_adapter.perform_enqueued_at_jobs
+        old_filter = queue_adapter.filter
+
+        begin
+          queue_adapter.perform_enqueued_jobs = true
+          queue_adapter.perform_enqueued_at_jobs = true
+          queue_adapter.filter = only
+          yield
+        ensure
+          queue_adapter.perform_enqueued_jobs = old_perform_enqueued_jobs
+          queue_adapter.perform_enqueued_at_jobs = old_perform_enqueued_at_jobs
+          queue_adapter.filter = old_filter
+        end
       end
 
       def queue_adapter

activejob/test/cases/test_helper_test.rb

@@ -199,6 +199,14 @@ def test_assert_enqueued_job_failure_with_global_id_args
 end
 
 class PerformedJobsTest < ActiveJob::TestCase
+  def test_performed_enqueue_jobs_with_only_option_doesnt_leak_outside_the_block
+    assert_equal nil, queue_adapter.filter
+    perform_enqueued_jobs only: HelloJob do
+      assert_equal HelloJob, queue_adapter.filter
+    end
+    assert_equal nil, queue_adapter.filter
+  end
+
   def test_assert_performed_jobs
     assert_nothing_raised do
       assert_performed_jobs 1 do