Add: link to documentation

Update guides/source/action_mailbox_basics.md Co-authored-by: Rafael França <rafael@franca.dev>
2021-03-30 10:19:45 +11:00 · 2021-03-30 10:19:45 +11:00 · 178b22f970
parent 6ce14ee4bc
commit 178b22f970
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--- a/guides/source/action_mailbox_basics.md
+++ b/guides/source/action_mailbox_basics.md
@ -373,3 +373,5 @@ class ForwardsMailboxTest < ActionMailbox::TestCase
  end
 end
 ```
+
+Please refer to the [ActionMailbox::TestHelper API](https://api.rubyonrails.org/classes/ActionMailbox/TestHelper.html) for further test helper methods.