From db94f492c099db89746f945a522aa7e59ede97cb Mon Sep 17 00:00:00 2001
From: Ryuta Kamizono <kamipo@gmail.com>
Date: Tue, 5 Mar 2019 21:05:50 +0900
Subject: [PATCH] Reset `connection_handlers` to default when any test dirties
 that

Most existing tests expects `connection_handlers` has only one default
handler, but the test added at #34779 dirties that.

We need to reset `connection_handlers` to default in that case.

Closes #35471.
---
 activerecord/test/cases/tasks/database_tasks_test.rb | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/activerecord/test/cases/tasks/database_tasks_test.rb b/activerecord/test/cases/tasks/database_tasks_test.rb
index 696003fcb8..06f11108f9 100644
--- a/activerecord/test/cases/tasks/database_tasks_test.rb
+++ b/activerecord/test/cases/tasks/database_tasks_test.rb
@@ -951,6 +951,10 @@ module ActiveRecord
 
       fixtures :authors, :author_addresses
 
+      def teardown
+        ActiveRecord::Base.connection_handlers = { writing: ActiveRecord::Base.default_connection_handler }
+      end
+
       def test_truncate_tables
         assert_operator Author.count, :>, 0
         assert_operator AuthorAddress.count, :>, 0