2 files changed, 10 insertions, 0 deletions
diff --git a/actionmailer/test/abstract_unit.rb b/actionmailer/test/abstract_unit.rb
index 1617b88c8e..ad1eac912b 100644
--- a/actionmailer/test/abstract_unit.rb
+++ b/actionmailer/test/abstract_unit.rb
@@ -9,6 +9,10 @@ require 'action_mailer/test_case'
 # Show backtraces for deprecated behavior for quicker cleanup.
 ActiveSupport::Deprecation.debug = true
 
+# Bogus template processors
+ActionView::Template.register_template_handler :haml, lambda { |template| "Look its HAML!" }
+ActionView::Template.register_template_handler :bak, lambda { |template| "Lame backup" }
+
 $:.unshift "#{File.dirname(__FILE__)}/fixtures/helpers"
 ActionMailer::Base.template_root = "#{File.dirname(__FILE__)}/fixtures"
 
diff --git a/actionmailer/test/mail_service_test.rb b/actionmailer/test/mail_service_test.rb
index c49049cc6a..e469302fe1 100644
--- a/actionmailer/test/mail_service_test.rb
+++ b/actionmailer/test/mail_service_test.rb
@@ -389,6 +389,8 @@ class ActionMailerTest < Test::Unit::TestCase
   end
 
   def test_custom_templating_extension
+    assert ActionView::Template.template_handler_extensions.include?("haml"), "haml extension was not registered"
+
     # N.b., custom_templating_extension.text.plain.haml is expected to be in fixtures/test_mailer directory
     expected = new_mail
     expected.to      = @recipient
@@ -799,6 +801,8 @@ EOF
   end
 
   def test_implicitly_multipart_messages
+    assert ActionView::Template.template_handler_extensions.include?("bak"), "bak extension was not registered"
+
     mail = TestMailer.create_implicitly_multipart_example(@recipient)
     assert_equal 3, mail.parts.length
     assert_equal "1.0", mail.mime_version
@@ -812,6 +816,8 @@ EOF
   end
 
   def test_implicitly_multipart_messages_with_custom_order
+    assert ActionView::Template.template_handler_extensions.include?("bak"), "bak extension was not registered"
+
     mail = TestMailer.create_implicitly_multipart_example(@recipient, nil, ["text/yaml", "text/plain"])
     assert_equal 3, mail.parts.length
     assert_equal "text/html", mail.parts[0].content_type