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-rw-r--r--activemodel/test/cases/callbacks_test.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activemodel/test/cases/callbacks_test.rb b/activemodel/test/cases/callbacks_test.rb
index f85cd7dec4..a5d29d0f22 100644
--- a/activemodel/test/cases/callbacks_test.rb
+++ b/activemodel/test/cases/callbacks_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "cases/helper"
class CallbacksTest < ActiveModel::TestCase