3 files changed, 55 insertions, 6 deletions
diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index acb9aff6aa..730dd2d7aa 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -420,12 +420,6 @@ module ActionMailer #:nodoc:
         new.deliver!(mail)
       end
 
-      def register_template_extension(extension)
-        ActiveSupport::Deprecation.warn(
-          "ActionMailer::Base.register_template_extension has been deprecated." +
-          "Use ActionView::Base.register_template_extension instead", caller)
-      end
-
       def template_root
         self.view_paths && self.view_paths.first
       end
diff --git a/actionmailer/test/asset_host_test.rb b/actionmailer/test/asset_host_test.rb
new file mode 100644
index 0000000000..1c92dd266d
--- /dev/null
+++ b/actionmailer/test/asset_host_test.rb
@@ -0,0 +1,54 @@
+require 'abstract_unit'
+
+class AssetHostMailer < ActionMailer::Base
+  def email_with_asset(recipient)
+    recipients recipient
+    subject    "testing email containing asset path while asset_host is set"
+    from       "tester@example.com"
+  end
+end
+
+class AssetHostTest < Test::Unit::TestCase
+  def setup
+    set_delivery_method :test
+    ActionMailer::Base.perform_deliveries = true
+    ActionMailer::Base.deliveries = []
+
+    @recipient = 'test@localhost'
+  end
+
+  def teardown
+    restore_delivery_method
+  end
+
+  def test_asset_host_as_string
+    ActionController::Base.asset_host = "http://www.example.com"
+    mail = AssetHostMailer.deliver_email_with_asset(@recipient)
+    assert_equal "<img alt=\"Somelogo\" src=\"http://www.example.com/images/somelogo.png\" />", mail.body.strip
+  end
+
+  def test_asset_host_as_one_arguement_proc
+    ActionController::Base.asset_host = Proc.new { |source|
+      if source.starts_with?('/images')
+        "http://images.example.com"
+      else
+        "http://assets.example.com"
+      end
+    }
+    mail = AssetHostMailer.deliver_email_with_asset(@recipient)
+    assert_equal "<img alt=\"Somelogo\" src=\"http://images.example.com/images/somelogo.png\" />", mail.body.strip
+  end
+
+  def test_asset_host_as_two_arguement_proc
+    ActionController::Base.asset_host = Proc.new {|source,request|
+      if request && request.ssl?
+        "https://www.example.com"
+      else
+        "http://www.example.com"
+      end
+    }
+    mail = nil
+    assert_nothing_raised { mail = AssetHostMailer.deliver_email_with_asset(@recipient) }
+    assert_equal "<img alt=\"Somelogo\" src=\"http://www.example.com/images/somelogo.png\" />", mail.body.strip
+  end
+end
+\ No newline at end of file
diff --git a/actionmailer/test/fixtures/asset_host_mailer/email_with_asset.html.erb b/actionmailer/test/fixtures/asset_host_mailer/email_with_asset.html.erb
new file mode 100644
index 0000000000..b3f0438d03
--- /dev/null
+++ b/actionmailer/test/fixtures/asset_host_mailer/email_with_asset.html.erb
@@ -0,0 +1 @@
+<%= image_tag "somelogo.png" %>
+\ No newline at end of file