Add Capybara Page Status Code as a rails til.

README.md

@@ -28,6 +28,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 ### rails
 
 - [Attribute Was](rails/attribute-was.md)
+- [Capybara Page Status Code](rails/capybara-page-status-code.md)
 - [Creating Records of Has_One Associations](rails/creating-records-of-has-one-associations.md)
 - [Show Pending Migrations](rails/show-pending-migrations.md)
 

rails/capybara-page-status-code.md

@@ -0,0 +1,18 @@
+# Capybara Page Status Code
+
+To quickly determine if a page is rendering as expected or not, you can
+check the status code of the page. If your page is rendering successfully,
+you'll see something like this:
+
+```ruby
+> page.status_code
+# => 200
+```
+
+If some sort of application authorization logic is causing the page to not
+render as normal, you may see something like this:
+
+```ruby
+> page.status_code
+# => 403
+```