Merge pull request rails#51823 from Shopify/gm/memoize-queue_adapter_for_test

[Bugfix] Memoize `queue_adapter_for_test`

Author: eileencodes

activejob/lib/active_job/test_helper.rb

@@ -39,8 +39,9 @@ def enable_test_adapter(test_adapter)
     end
 
     def before_setup # :nodoc:
+      queue_adapter_specific_to_this_test_class = queue_adapter_for_test
       queue_adapter_changed_jobs.each do |klass|
-        if (queue_adapter_specific_to_this_test_class = queue_adapter_for_test)
+        if queue_adapter_specific_to_this_test_class
           klass.enable_test_adapter(queue_adapter_specific_to_this_test_class)
         elsif klass._queue_adapter.nil?
           klass.enable_test_adapter(ActiveJob::QueueAdapters::TestAdapter.new)

activejob/test/cases/test_helper_test.rb

@@ -806,6 +806,24 @@ def test_assert_enqueued_jobs_with_performed
   end
 end
 
+class QueueAdapterTest < ActiveJob::TestCase
+  class JobWithAnAdapter < ActiveJob::Base
+    self.queue_adapter = :async
+
+    def perform; end
+  end
+
+  def queue_adapter_for_test
+    ActiveJob::QueueAdapters::TestAdapter.new
+  end
+
+  test "assert_enqueued_with enqueues a job with a queue_adapter and queue_adapter_for_test" do
+    assert_enqueued_with(job: JobWithAnAdapter) do
+      JobWithAnAdapter.perform_later
+    end
+  end
+end
+
 class PerformedJobsTest < ActiveJob::TestCase
   if adapter_is?(:test)
     include DoNotPerformEnqueuedJobs