Allow users to configure the queue for the mailers

This allow the users to do:

    config.action_mailer.queue = MyQueue.new

and

    class UsersMailer < ActionMailer::Base
      self.queue = MyQueue.new
    end

1 files changed, 17 insertions, 0 deletions

diff --git a/railties/test/application/initializers/frameworks_test.rb b/railties/test/application/initializers/frameworks_test.rb
index fbce97e1a9..1eb5fce384 100644
--- a/railties/test/application/initializers/frameworks_test.rb
+++ b/railties/test/application/initializers/frameworks_test.rb
@@ -50,6 +50,23 @@ module ApplicationTests
       assert_equal "test.rails", ActionMailer::Base.default_url_options[:host]
     end
 
+    test "uses the default queue for ActionMailer" do
+      require "#{app_path}/config/environment"
+      assert_kind_of Rails::Queueing::Container, ActionMailer::Base.queue
+    end
+
+    test "allows me to configure queue for ActionMailer" do
+      app_file "config/environments/development.rb", <<-RUBY
+        AppTemplate::Application.configure do
+          Rails.queue[:mailer] = Rails::Queueing::TestQueue.new
+          config.action_mailer.queue = Rails.queue[:mailer]
+        end
+      RUBY
+
+      require "#{app_path}/config/environment"
+      assert_kind_of Rails::Queueing::TestQueue, ActionMailer::Base.queue
+    end
+
     test "does not include url helpers as action methods" do
       app_file "config/routes.rb", <<-RUBY
         AppTemplate::Application.routes.draw do