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-rw-r--r--activesupport/lib/active_support/log_subscriber/test_helper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/log_subscriber/test_helper.rb b/activesupport/lib/active_support/log_subscriber/test_helper.rb
index 953ee77c2a..57d522c12d 100644
--- a/activesupport/lib/active_support/log_subscriber/test_helper.rb
+++ b/activesupport/lib/active_support/log_subscriber/test_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/log_subscriber"
require "active_support/logger"
require "active_support/notifications"