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-rw-r--r--guides/source/testing.md50
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diff --git a/guides/source/testing.md b/guides/source/testing.md
index 02b60a395b..9541598b26 100644
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+++ b/guides/source/testing.md
@@ -1397,6 +1397,56 @@ class ProfileControllerTest < ActionDispatch::IntegrationTest
end
```
+#### Using Separate Files
+
+If you find your helpers are cluttering `test_helper.rb`, you can extract them into separate files. One good place to store them is `lib/test`.
+
+```ruby
+# lib/test/multiple_assertions.rb
+module MultipleAssertions
+ def assert_multiple_of_fourty_two(number)
+ assert (number % 42 == 0), 'expected #{number} to be a multiple of 42'
+ end
+end
+```
+
+These helpers can then be explicitly required as needed and included as needed
+
+```ruby
+require 'test_helper'
+require 'test/multiple_assertions'
+
+class NumberTest < ActiveSupport::TestCase
+ include MultipleAssertions
+
+ test '420 is a multiple of fourty two' do
+ assert_multiple_of_fourty_two 420
+ end
+end
+```
+
+or they can continue to be included directly into the relevant parent classes
+
+```ruby
+# test/test_helper.rb
+require 'test/sign_in_helper'
+
+class ActionDispatch::IntegrationTest
+ include SignInHelper
+end
+```
+
+#### Eagerly Requiring Helpers
+
+You may find it convenient to eagerly require helpers in `test_helper.rb` so your test files have implicit access to them. This can be accomplished using globbing, as follows
+
+```ruby
+# test/test_helper.rb
+Dir[Rails.root.join('lib', 'test', '**', '*.rb')].each { |file| require file }
+```
+
+This has the downside of increasing the boot-up time, as opposed to manually requiring only the necessary files in your individual tests.
+
Testing Routes
--------------