1 files changed, 25 insertions, 0 deletions
diff --git a/railties/test/application/mailer_previews_test.rb b/railties/test/application/mailer_previews_test.rb
index c588fd7012..1752a9f3c6 100644
--- a/railties/test/application/mailer_previews_test.rb
+++ b/railties/test/application/mailer_previews_test.rb
@@ -26,6 +26,31 @@ module ApplicationTests
       assert_equal 404, last_response.status
     end
 
+    test "/rails/mailers is accessible with correct configuraiton" do
+      add_to_config "config.action_mailer.show_previews = true"
+      app("production")
+      get "/rails/mailers"
+      assert_equal 200, last_response.status
+    end
+
+    test "/rails/mailers is not accessible with show_previews = false" do
+      add_to_config "config.action_mailer.show_previews = false"
+      app("development")
+      get "/rails/mailers"
+      assert_equal 404, last_response.status
+    end
+
+    test "/rails/mailers is accessible with globbing route present" do
+      app_file "config/routes.rb", <<-RUBY
+        Rails.application.routes.draw do
+          get '*foo', to: 'foo#index'
+        end
+      RUBY
+      app("development")
+      get "/rails/mailers"
+      assert_equal 200, last_response.status
+    end
+
     test "mailer previews are loaded from the default preview_path" do
       mailer 'notifier', <<-RUBY
         class Notifier < ActionMailer::Base