From f43c0842a1fd02aaab48a43c7a7a6f0cbc3f561d Mon Sep 17 00:00:00 2001
From: ganmacs <ganmacs@gmail.com>
Date: Thu, 4 Aug 2016 14:12:59 +0900
Subject: [PATCH] Add a comment why this module is needed

---
 test/plugin/test_out_forward.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/plugin/test_out_forward.rb b/test/plugin/test_out_forward.rb
index 173dfc9efb..e3248a782a 100644
--- a/test/plugin/test_out_forward.rb
+++ b/test/plugin/test_out_forward.rb
@@ -530,6 +530,8 @@ def test_heartbeat_type_none
     assert_equal node.available, true
   end
 
+  # To suppress calling `ForwardInput#start` in `DummyEngineDriver`,
+  # `DummyEnigneDriver` should avoid calling CallSuperMixin.prepend at `Fluent::Compat::Input#initialize`.
   module SuppressCallSuperMixin
     def start
       _start