Merge pull request #39472

Closes #39472.

activejob/lib/active_job/railtie.rb

@@ -13,27 +13,22 @@ module ActiveJob
       ActiveSupport.on_load(:active_job) { self.logger = ::Rails.logger }
     end
 
-    initializer "active_job.custom_serializers" do |app|
+    initializer "active_job.set_configs" do
-      config.after_initialize do
+      config.after_initialize do |app|
-        custom_serializers = app.config.active_job.delete(:custom_serializers)
-        ActiveJob::Serializers.add_serializers custom_serializers
-      end
-    end
-
-    initializer "active_job.set_configs" do |app|
         options = app.config.active_job
         options.queue_adapter ||= :async
 
+        custom_serializers = options.delete(:custom_serializers)
+        ActiveJob::Serializers.add_serializers custom_serializers
+
         ActiveSupport.on_load(:active_job) do
-        options.each do  |k, v|
+          options.each { |k, v| send("#{k}=", v) }
-          k = "#{k}="
-          send(k, v) if respond_to? k
-        end
         end
 
         ActiveSupport.on_load(:action_dispatch_integration_test) do
           include ActiveJob::TestHelper
         end
+      end
 
       ActiveSupport.on_load(:active_record) do
         self.destroy_association_async_job = ActiveRecord::DestroyAssociationAsyncJob

railties/test/application/configuration_test.rb

@@ -2322,6 +2322,17 @@ module ApplicationTests
       assert_equal true, ActionView::Helpers::FormTagHelper.default_enforce_utf8
     end
 
+    test "raises when unknown configuration option is set for ActiveJob" do
+      add_to_config <<-RUBY
+        config.active_job.unknown = "test"
+      RUBY
+
+      assert_raise(NoMethodError) do
+        app "development"
+        ActiveJob::Base # load active_job
+      end
+    end
+
     test "ActiveJob::Base.retry_jitter is 0.15 by default for new apps" do
       app "development"