1 files changed, 23 insertions, 0 deletions
diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 1b2e39b3f7..144a6bfe39 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -7,6 +7,8 @@ require 'active_support/time'
 require 'mailers/base_mailer'
 require 'mailers/proc_mailer'
 require 'mailers/asset_mailer'
+require 'mailers/async_mailer'
+require 'rails/queueing'
 
 class BaseTest < ActiveSupport::TestCase
   def teardown
@@ -419,6 +421,26 @@ class BaseTest < ActiveSupport::TestCase
     assert_equal(1, BaseMailer.deliveries.length)
   end
 
+  def stub_queue(klass, queue)
+    Class.new(klass) {
+      extend Module.new {
+        define_method :queue do
+          queue
+        end
+      }
+    }
+  end
+
+  test "delivering message asynchronously" do
+    testing_queue = Rails::Queueing::TestQueue.new
+    AsyncMailer.delivery_method = :test
+    AsyncMailer.deliveries.clear
+    stub_queue(AsyncMailer, testing_queue).welcome.deliver
+    assert_equal(0, AsyncMailer.deliveries.length)
+    testing_queue.drain
+    assert_equal(1, AsyncMailer.deliveries.length)
+  end
+
   test "calling deliver, ActionMailer should yield back to mail to let it call :do_delivery on itself" do
     mail = Mail::Message.new
     mail.expects(:do_delivery).once
@@ -434,6 +456,7 @@ class BaseTest < ActiveSupport::TestCase
   end
 
   test "should raise if missing template in implicit render" do
+    BaseMailer.deliveries.clear
     assert_raises ActionView::MissingTemplate do
       BaseMailer.implicit_different_template('missing_template').deliver
     end