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+*   Fixed serializing `:at` option for `assert_enqueued_with`
+    and `assert_performed_with`.
+
+    *Wojciech Wnętrzak*
+
+*   Support passing array to `assert_enqueued_jobs` in `:only` option.
+
+    *Wojciech Wnętrzak*
+
+*   Add job priorities to Active Job.
+
+    *wvengen*
+
+*   Implement a simple `AsyncJob` processor and associated `AsyncAdapter` that
+    queue jobs to a `concurrent-ruby` thread pool.
+
+    *Jerry D'Antonio*
+
+*   Implement `provider_job_id` for `queue_classic` adapter. This requires the
+    latest, currently unreleased, version of queue_classic.
+
+    *Yves Senn*
+
+*   `assert_enqueued_with` and `assert_performed_with` now returns the matched
+    job instance for further assertions.
+
+    *Jean Boussier*
+
+*   Include I18n.locale into job serialization/deserialization and use it around
+    `perform`.
+
+    Fixes #20799.
+
+    *Johannes Opper*
+
+*   Allow `DelayedJob`, `Sidekiq`, `qu`, and `que` to report the job id back to
+    `ActiveJob::Base` as `provider_job_id`.
+
+    Fixes #18821.
+
+    *Kevin Deisz*, *Jeroen van Baarsen*
+
+*   `assert_enqueued_jobs` and `assert_performed_jobs` in block form use the
+    given number as expected value. This makes the error message much easier to
+    understand.
+
+    *y-yagi*
+
+*   A generated job now inherits from `app/jobs/application_job.rb` by default.
+
+    *Jeroen van Baarsen*
+
+*   Add an `:only` option to `perform_enqueued_jobs` to filter jobs based on
+    type.
+
+    This allows specific jobs to be tested, while preventing others from
+    being performed unnecessarily.
+
+    Example:
+
+        def test_hello_job
+          assert_performed_jobs 1, only: HelloJob do
+            HelloJob.perform_later('jeremy')
+            LoggingJob.perform_later
+          end
+        end
+
+    An array may also be specified, to support testing multiple jobs.
+
+    Example:
+
+        def test_hello_and_logging_jobs
+          assert_nothing_raised do
+            assert_performed_jobs 2, only: [HelloJob, LoggingJob] do
+              HelloJob.perform_later('jeremy')
+              LoggingJob.perform_later('stewie')
+              RescueJob.perform_later('david')
+            end
+          end
+        end
+
+    Fixes #18802.
+
+    *Michael Ryan*
+
+*   Allow keyword arguments to be used with Active Job.
+
+    Fixes #18741.
+
+    *Sean Griffin*
+
+*   Add `:only` option to `assert_enqueued_jobs`, to check the number of times
+    a specific kind of job is enqueued.
+
+    Example:
+
+        def test_logging_job
+          assert_enqueued_jobs 1, only: LoggingJob do
+            LoggingJob.perform_later
+            HelloJob.perform_later('jeremy')
+          end
+        end
+
+    *George Claghorn*
+
+*   `ActiveJob::Base.deserialize` delegates to the job class.
+
+    Since `ActiveJob::Base#deserialize` can be overridden by subclasses (like
+    `ActiveJob::Base#serialize`) this allows jobs to attach arbitrary metadata
+    when they get serialized and read it back when they get performed.
+
+    Example:
+
+        class DeliverWebhookJob < ActiveJob::Base
+          def serialize
+            super.merge('attempt_number' => (@attempt_number || 0) + 1)
+          end
+
+          def deserialize(job_data)
+            super
+            @attempt_number = job_data['attempt_number']
+          end
+
+          rescue_from(TimeoutError) do |exception|
+            raise exception if @attempt_number > 5
+            retry_job(wait: 10)
+          end
+        end
+
+    *Isaac Seymour*
+
+Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activejob/CHANGELOG.md) for previous changes.