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-rw-r--r--guides/source/engines.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/guides/source/engines.md b/guides/source/engines.md
index 837b736953..bd0542ffc1 100644
--- a/guides/source/engines.md
+++ b/guides/source/engines.md
@@ -1507,6 +1507,7 @@ To hook into the initialization process of one of the following classes use the
| `ActionDispatch::SystemTestCase` | `action_dispatch_system_test_case` |
| `ActionMailbox::Base` | `action_mailbox` |
| `ActionMailbox::InboundEmail` | `action_mailbox_inbound_email` |
+| `ActionMailbox::TestCase` | `action_mailbox_test_case` |
| `ActionMailer::Base` | `action_mailer` |
| `ActionMailer::TestCase` | `action_mailer_test_case` |
| `ActionView::Base` | `action_view` |