Provide the ability to override the queue adapter used by jobs under

test.

This PR adds a method called `queue_adapter_for_test` to
`ActiveJob::TestHelper`. This method is expected to provide the queue
adapter to be used for jobs under test. It maintains the current
behaviour by defaulting to an instance of
`ActiveJob::QueueAdapter::TestAdapter`. Tests that include
`ActiveJob::TestHelper` or extend from `ActiveJob::TestCase` can provide
a custom queue adapter by overriding `queue_adapter_for_test` in their
class.

1 files changed, 12 insertions, 0 deletions

diff --git a/activejob/test/cases/test_helper_test.rb b/activejob/test/cases/test_helper_test.rb
index f7ee763e8a..3d863f5e65 100644
--- a/activejob/test/cases/test_helper_test.rb
+++ b/activejob/test/cases/test_helper_test.rb
@@ -509,3 +509,15 @@ class PerformedJobsTest < ActiveJob::TestCase
     assert_equal 2, ActiveJob::Base.queue_adapter.performed_jobs.count
   end
 end
+
+class OverrideQueueAdapterTest < ActiveJob::TestCase
+  class CustomQueueAdapter < ActiveJob::QueueAdapters::TestAdapter; end
+
+  def queue_adapter_for_test
+    CustomQueueAdapter.new
+  end
+
+  def test_assert_job_has_custom_queue_adapter_set
+    assert_instance_of CustomQueueAdapter, HelloJob.queue_adapter
+  end
+end